Malicious PDF — malware analysis report

Static analysis result for SHA-256 4975d2482e7f4a17…

MALICIOUS

PDF

52.7 KB Created: 2020-10-28 23:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ed04d4cbe8235ba5c439cd8021bc71c SHA-1: d55891620823321df5a2f2a5b3f9a395288788f0 SHA-256: 4975d2482e7f4a17f30406ffdae7d19a0c099d465e561c62587f5a6648f3e3ca
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary purpose is to lure users to malicious sites. No scripts were extracted, but the presence of malicious links and the ML detection point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=giant+squid+5e
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5f973545f19da.pdf
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5f927afba1626.pdf
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f919ea9ab841.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f99d4d1c7065.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f8a163554c66.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f946ec322273.pdf
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/davamev.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f8cc499d958b.pdf
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/d29eaf9051ab5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3672f93d-4864-410a-83e2-6399e21ff9f9/72199258162.pdf
    • https://uploads.strikinglycdn.com/files/5a63128a-a663-4774-8104-4abf6d36383f/8104254211.pdf
    • https://uploads.strikinglycdn.com/files/31a61de2-2e1b-4179-9a22-2d3ffd38373a/.pdf
    • https://uploads.strikinglycdn.com/files/0583597b-431e-42f1-b9d7-d6854f6fff1c/exercice_nombre_dcimaux_6me.pdf
    • https://uploads.strikinglycdn.com/files/3d53de11-08d9-4cb6-93e5-b2560212eae5/sapetoko.pdf
    • https://uploads.strikinglycdn.com/files/54e8f7c1-29db-4127-9816-7913c61d8ca9/vurodomawibamesa.pdf
    • https://uploads.strikinglycdn.com/files/8f49e90d-32f1-4a18-81dc-7fb478cc870f/manual_for_eucharistic_adoration.pdf
    • https://uploads.strikinglycdn.com/files/aae37196-6e29-4dd4-951a-b63809d72c73/buremajivezotipevog.pdf
    • https://uploads.strikinglycdn.com/files/13cc6c48-4a8d-4bdd-abad-5f91282ea525/60145058752.pdf
    • https://uploads.strikinglycdn.com/files/86e57ced-40bc-43d2-ae77-b02b3f62a777/ferijufeputetimuwed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007448.bin
227a2b1b0cceae28956e652425b0452971efe864da420741b18ac9d61b6e6c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 4972 bytes
font_01_sfnt_off00008548.bin
9a34a462dff9e193de613c5d6d53d7d7aeaf59576acd1be9f611a7b3b9050b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8548 11040 bytes
font_02_sfnt_off0000aaae.bin
a357ae88ae2c27043a26e5b3f28952fba9bc1faf1449371c18ee00af981059ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAAE 17636 bytes

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