Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12809aaa85630b9…

MALICIOUS

PDF

55.7 KB Created: 2020-10-25 06:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ee0eddc5b2534b1a7d644bac4c70540e SHA-1: c70cfb0db016837d7536746cfb0ebfd9a7fd8136 SHA-256: b12809aaa85630b949d9fbedfe5ea10498c121ab04d1371faac72e9bf6cef3e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the text 'Korean keyboard for android free download' and a URL that appears to be a lure. The presence of numerous links to disposable hosting and a known malicious redirector indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/123?keyword=korean+keyboard+for+android+free+download In PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/didafozekibetababam.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/57f8d230718.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/9192808.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/1127a31.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/cd3f3c.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/20c3f721d7dce3.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/4202832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b6f362-642c-4581-a119-03be69aeeae3/pexisefusota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d114e1-9d62-4641-a0fb-194edb1253e4/60467643227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51885762-b2ce-4e61-ba0e-e1ea377662ba/nazuguzozizejojanum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/occupations_worksheets_for_preschool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7562/5894/files/pu_holidays_list_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5453/4308/files/14062328835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/belt_conveyor_brochure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8997/2385/files/mafumetulepikevovof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e93efd7-0308-4363-8617-cbd911bfe1ef/xutigoramasurazuwitirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cb29a9-127a-422c-ab33-a1094d01ab41/raxerikipulenaxirepaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fb1f3b-1152-4282-bdcb-6701d0b03145/83858277276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92667ac7-6ac8-4cb0-9fb3-c8b89e7703ae/main_hoon_na_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3631e134-75b1-49e0-a537-42f392099e1a/lulugivurutuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 4032 bytes
SHA-256: 20052b5cf267b1b45d9e6f14bb326482202e0a155fb8473e537976bb4189f003
font_01_sfnt_off00007827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 5088 bytes
SHA-256: 1a6e0164b121c346673e9f91af5300102e95dddfd4b5d73ba412e7229ac0d9f3
font_02_sfnt_off0000899a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899A 2212 bytes
SHA-256: da6d78aabf2e0c131008e37c11e4029f2c1c73ee37dba6522cd96161b08373bb
font_03_sfnt_off000093b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B3 10868 bytes
SHA-256: f49eb280ef2c634d9362490d155375d3b32720cc66bfd6ab8e15dbadca0aa958
font_04_sfnt_off0000b8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CB 16232 bytes
SHA-256: 9d45500f9f1b11e5ec9037cdd139ed656904863fcf93de78296bf3df66a6e380

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