Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d26ec5170f22ac…

MALICIOUS

PDF

44.9 KB Created: 2020-11-02 03:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6ff03bdf344fa73f71dd7e4155fc30d SHA-1: 9137f37e52cb0455455a46d9083c9cafad103457 SHA-256: a5d26ec5170f22ac09c45239a7bc7bfe0b3f8658b273cd0896434a117f83b96f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=transcription+biology+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5f92001e84b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9036c27c976.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/vasome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5f952bc9825c0.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/1/0484/3972/2138/files/harper_biochemistry_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/escalation_protocol_schedule_april_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5502/0693/files/mr_s_leather_gift_card.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9616/5534/files/22752219508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/lizifon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0174/0964/files/lazadosiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 5764 bytes
SHA-256: b383a273689b1701a5afaf2c867d7a04abf2ce50dc53f9b25f1a73e582443cae
font_01_sfnt_off00006e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E02 10248 bytes
SHA-256: a4cfd0e7dfa370137caa08f813d1c7d98ac193eebc729be5e4bc9bccc41ba1f3
font_02_sfnt_off000090d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D1 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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