Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9c1c9804b919fa…

MALICIOUS

PDF

61.0 KB Created: 2020-10-09 04:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b6a7195acb02e2d0dcd34aada8f2aea1 SHA-1: aed6befc2fbaa1ac5e7a1b66bc69f50e8708b920 SHA-256: af9c1c9804b919fa9d93b97a7f590b918b03ba50b6c1fb469331934c90d72c83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and others to PDF link farms. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable, but the presence of URLs suggests an attempt to redirect users to external sites, potentially for phishing or malware distribution.

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/strik?keyword=modelos+de+trabajo+social In PDF document text
    • http://maximuw.aerofamilyhealth.com/uploads/1/3/1/4/131483249/nozibox-dejexu.pdfIn PDF document text
    • http://files.tamargoksoyr.com/uploads/1/3/1/0/131070712/3f5a6f17e065.pdfIn PDF document text
    • http://files.or-chadash.org/uploads/1/3/2/7/132710491/tigapomaxaw_xupaputukopu_wilobewaf_nalebajuz.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/sulevikezetak.pdfIn PDF document text
    • https://site-1039578.mozfiles.com/files/1039578/74578443280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3458/2421/files/kogoluxukadepetunovubimip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/9252/1383/files/eso_attribute_points_templar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1617/8842/files/visifafona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1954/7036/files/star_stable_star_coins_hack_no_human_verification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4372/0868/files/77095594564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3212c772-bf9b-40b7-89bb-25c0f3682e86/64348919135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478532d0-48fe-421d-bd67-35a0fb7b2aef/renofiwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2410f0e2-99a8-41a4-8e31-3337c3be6bcd/rugon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb52af2-3edd-43ae-bdce-cc8e84ea5552/58658838491.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 5156 bytes
SHA-256: d82f0711f351627980a5f253ff38aa960feb8dd647940e83006878d7987bff55
font_01_sfnt_off0000c0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 11544 bytes
SHA-256: b016e80291bc85e97f201e6bdbce56992eea8880f16d9ec068412662eb0efa7a

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