Malicious PDF — malware analysis report

Static analysis result for SHA-256 340fb87612cbbb20…

MALICIOUS

PDF

40.5 KB Created: 2020-08-15 06:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f457e3d0a2f83486d3fb77cb8168a0ca SHA-1: 7bc6840c4bd91f1997065b98b6df60c5d5dd1e6b SHA-256: 340fb87612cbbb207d12b3c273d9501ca29ce77f670823b7de87714f6a30d3bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious infrastructure, disguised with a keyword relevant to "Scrum guide Indonesia". It also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or redirection attempt.

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.ru/pify?keyword=scrum+guide+indonesia
    • http://files.phouka-pugs.com/uploads/1/3/0/9/130969065/bedivurotuxotij-sitaniriluk.pdf
    • http://ginasotol.drinkinggames.beer/uploads/1/3/1/3/131383544/6506912.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/69272537689.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/9485381926.pdf
    • https://cdn.shopify.com/s/files/1/0428/9570/4227/files/jazonevupukapovaruta.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/bofap.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/74961689727.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/58154156300.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/26555239702.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/44147301691.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/riwevike.pdf
    • 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_off000061db.bin
c89afe6c8010e41b99bf1e96dfe558a7239eb1a24e777fc502ae12c5f7b226ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DB 5328 bytes
font_01_sfnt_off000073d2.bin
0f17877ebe1607d4c67a2724974059a3ba6fdeef3bba3deb25a12414f648e483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D2 9932 bytes

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