Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52abcaad6baa464…

MALICIOUS

PDF

44.4 KB Created: 2020-10-26 20:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf19d5ced8675a247c1ae9514cbfe5cc SHA-1: 58b06bb78399f99718f636d9e6e7987280e81407 SHA-256: a52abcaad6baa464343e9700f0f1fcb70e0f79f26b9c80bc81bfc3a16ef0880f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes text and URLs that suggest a lure to a malicious site. The presence of a large number of external PDF links, many pointing to benign Shopify domains, indicates a potential SEO link farm used to mask malicious activity. No scripts were extracted, but the primary malicious behavior observed is the redirection to a known malicious URL.

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://cctraff.ru/wb?keyword=reading%20the%20proclamation%20of%20the%20philippine%20independence%20pdf In PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/zofijijitotuwav-madozanog-bikupadejemixa.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/kovesulowapo-tapufovus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9087/9667/files/can_you_build_android_apps_with_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/nazefugegubamixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/9854/6599/files/mirol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4295/8231/files/44291326616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/74239088071.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/caesarean_moon_births.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/aircraft_structure_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/faxopaxoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3343e9a3-2505-41ce-86cb-f9a7008d2111/60439334387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b58f3cd-31ec-4e6d-96d6-3ac815c6cb9b/xexinufojimom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d1d51f-d051-4b14-8d3c-ed642d96a765/xitamaseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e64bd18-d5ee-428e-b2a1-528accd35e72/bazoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8bbafec-3ca6-44f6-a5e4-e0c18b348c56/88069410584.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/leveling_guide_tera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1510/9312/files/how_to_calculate_producer_surplus_from_a_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8285/1500/files/carefree_boat_club_cost_seattle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0095/7608/files/leading_safe_4.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/28665841378.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 5188 bytes
SHA-256: 34614871d87feaa3e2936afe3c8c5d9a2ea92542260b1c231e51b7fe290e1328
font_01_sfnt_off000073b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 10044 bytes
SHA-256: 6c55ec30746f9292a19054fc76d54c9ec213e3e3625c672cd459df2f2e320935
font_02_sfnt_off000095ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95CE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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