Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a1fb98a6bba96…

MALICIOUS

PDF

33.7 KB Created: 2020-11-02 21:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae28444d367e48c8644c949172dac696 SHA-1: 1d0009b0b9edd9ebba1f580206424cddad471fd2 SHA-256: f26a1fb98a6bba96927a4e3b1f92aecb5e8ce940427cd068d6620a3c31830aaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document body and heuristics indicate a link farm strategy, likely to distribute malware or conduct phishing. The ML classifier strongly suggests malicious intent.

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/123?keyword=werewolf+alpha+dnd In PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/nawumewiwukik.pdfIn PDF document text
    • https://memibiwogiluged.weebly.com/uploads/1/3/4/1/134131866/guwelapopare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f99f13343109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/zabowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/todamaxurarisarizepuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7795/2186/files/notifyer_unread_count_pro_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5574/9541/files/64397125274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8039/9003/files/decodable_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/14280061027.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4333/0492/files/idle_heroes_cheats_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0510/6139/1525/files/blue_ram_cichlid_tank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8189/2509/files/uniden_bc72xlt_scanner_programming_instructions.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_off00004808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4808 5056 bytes
SHA-256: 41a5b0ab128452086132b60f3ed632e2f2b62ec674c1e04684407eadb1a9521c
font_01_sfnt_off0000594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x594C 9640 bytes
SHA-256: b40147fb6d695d87036122fb3f7a0199d0aef6da09df86bb242db0fff5d484b9

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