Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef26ec135d71eb6a…

MALICIOUS

PDF

60.9 KB Created: 2020-10-31 13:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7c5e555d32d1c7b488242643a4f5fe0a SHA-1: 2600b9b64fe706c04852ed3e9b0d9d6c228d4d97 SHA-256: ef26ec135d71eb6a751d48d80f7c0280735fbfd66e19b98b1d90ab6df78d25df
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.club/123?keyword=32+oz+to+lbs+conversion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f91c6831b46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5f8c76ad49b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f966fd72e4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f9924eb2804f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f97cfec24215.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/1/0500/0190/3766/files/brocade_san_switch_cli_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/emerson_self_reliance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dd742c-7ea1-4c01-b9f7-3cda45a8da0c/2014_frq_ap_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/wow_classic_call_of_fire_durotar.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b704.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB704 26528 bytes
SHA-256: a459e0ea6d155cd754c773bdec4d4ed10f1cd9bff038689ba3d5e824b3ca0a81
font_00_sfnt_off0000704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 4108 bytes
SHA-256: 3717d646a89227f3c3583fef3f9d155831ae7e78410882bb77ea617733a279bf
font_01_sfnt_off00007ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECB 5036 bytes
SHA-256: 28e480ae1360a5b4359f055e54cd03d063e8007cb95725b1c2b1921fc71554b8
font_02_sfnt_off00009006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9006 11296 bytes
SHA-256: 9d87493976d33dd95cb3cb9d5e8bf4050f0a636f5737e3c790b5864c530080d9

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