Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a97c4ea5958a52…

MALICIOUS

PDF

42.6 KB Created: 2020-09-20 11:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ca1160f24240acefaebd792401847a61 SHA-1: dd08b6fb0e3f31cec1bd94632a86562c6d1b48e2 SHA-256: 25a97c4ea5958a521ae51968b87a8efad3d08e481d1cfee44d499234503f738f
154 Risk Score

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://ttraff.link/wix?keyword=camp+invention+2020+theme In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c66c14-2d5a-4968-8206-41b0d9357f65.filesusr.com/ugd/cc15ef_f9a0df81937b4bef84da375f782e194e.pdf?index=trueIn PDF document text
    • https://8bd80789-3261-4efc-b682-e8b3efd14b9b.filesusr.com/ugd/6166c9_edf619ce5935431187a6283a089e3b0a.pdf?index=trueIn PDF document text
    • https://0b22e725-5ee9-438c-9974-be5373a28a2a.filesusr.com/ugd/8e9e2f_ae93e45ab76645aab95c2adab3e8735f.pdf?index=trueIn PDF document text
    • https://6d8af714-fb0c-4692-b072-0556c118909d.filesusr.com/ugd/067ecb_fad47fc94e8a426d8a9b941a59497707.pdf?index=trueIn PDF document text
    • https://aef514b9-edbc-4368-aef4-abafa5392d1a.filesusr.com/ugd/911c12_d2de0a05e8d34d4ca73a75c65602eb84.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/omega_3_fatty_acids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/android_9._0_tv_box_4g_32g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4173/4307/files/lalitha_sahasranamam_by_challakere_brothers_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/ligetinav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/sifufovixiginos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5917/3784/files/3026553798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/36596691097.pdfIn PDF document text
    • https://4f3b9068-d646-4acd-9248-fa90275d88a0.filesusr.com/ugd/ab922d_7ab3e04557f946fa83164f209050d80b.pdf?index=trueIn PDF document text
    • https://b7e665fe-f05e-4f8b-804c-3c34a114c76b.filesusr.com/ugd/108936_e11f5fffa5ea40bb9429a1cc9404c327.pdf?index=trueIn PDF document text
    • https://b4836faf-db92-46b5-b03f-2d5b83b8d061.filesusr.com/ugd/2e16aa_dae4ea878c2e4f86a2df11c0fb73ff3e.pdf?index=trueIn 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_off000067c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 4992 bytes
SHA-256: 7127c7e8d5bd1a654f1a68f66bbb734e287ef9781118965e939a1435393a98d3
font_01_sfnt_off000078a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 10920 bytes
SHA-256: 1bb79bb5faa29de6d4fc6009d36ed5469fa5241a07709ec09515a62001fcf219

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