Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ea9b4b238cec72…

MALICIOUS

PDF

39.8 KB Created: 2020-09-18 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010e6c896ce0024dabb4ecd348447de6 SHA-1: faa3ec40333ebbdcd18115faa96288bacf7b76f6 SHA-256: 71ea9b4b238cec72778071a27d0cc90c18ac1570f30a80d361ed65012c9b6787
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical redirector link. This suggests a link farm or SEO manipulation tactic, potentially leading to phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=royal+oaks+elementary+visalia+ca
    • http://files.wviolin.com/uploads/1/3/1/3/131384340/bupivesufot_wenobitinajiku_digateveke_zegoxorunulu.pdf
    • http://nukige.duraesenterprise.com/uploads/1/3/0/7/130739678/4546183.pdf
    • http://files.greatwhytesurfboards.com/uploads/1/3/1/6/131636843/d3f848dd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/gejogupemamog.pdf
    • https://cdn.shopify.com/s/files/1/0481/4415/4775/files/toyota_forklift_5fgc25_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/arthrobotrys_oligospora.pdf
    • https://17e89970-3c16-4d86-86cf-5a4284d2f336.filesusr.com/ugd/9734e7_eb4824ffdae9483b98664417f2fc685b.pdf?index=true
    • https://187716eb-d9d9-4a43-86ed-b3411fbbfa63.filesusr.com/ugd/314c35_d207700aff85463daa58dadb79315203.pdf?index=true
    • https://12a3a3b9-8960-4df3-9c73-6b3d8fcc5d31.filesusr.com/ugd/8ebb60_f1667cf73e3843d9b64d9b71d659447d.pdf?index=true
    • https://ef3c155e-c15b-4b39-8b56-4a0ffe2a8655.filesusr.com/ugd/7820d0_9d09940cc8474dfa884bdf24680f84ce.pdf?index=true
    • https://5ea35eed-bc7e-45af-ada5-85256fadb596.filesusr.com/ugd/b916f4_c3c6d15ad8f140f09d7484310a749d52.pdf?index=true
    • https://9fd018b8-fb4d-4df9-9355-1f431dec0800.filesusr.com/ugd/2f7489_de24cf04e2cf4e61b98cc3adc140dc57.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d21.bin
2b4a923b709d39d3c043bfe21d7a2a10d1ac576e961b412c5823fd705a60be2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D21 5176 bytes
font_01_sfnt_off00006eba.bin
729a9e8cadfd61fbb2b1155431a6b714f9b984811e9d870bd15d366aa1182372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 10524 bytes

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