Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4fe47580d42fcd…

MALICIOUS

PDF

43.9 KB Created: 2020-08-12 07:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b6b13218c256ede3cd17b902fd5b0a2 SHA-1: 4aac3d63edda32dcb1270b90a73b9c5cfb367841 SHA-256: 0f4fe47580d42fcd3ec580e1d18efb73fe32e25d0c7acd5e2be931f180ca2913
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=caprini+risk+assessment+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt, likely to obscure the malicious redirector.

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=caprini+risk+assessment+pdf
    • http://files.headandneckultrasound.com/uploads/1/3/1/4/131453555/gilagunozejikom-dewosofisa-borer.pdf
    • http://files.iamnotmylaundry.com/uploads/1/3/1/8/131858043/df097d0fa2f1c.pdf
    • http://files.hookedontravelagency.com/uploads/1/3/0/7/130776602/2848163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/7529151627.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/acute_pancreatitis_scoring_systems.pdf
    • https://cdn.shopify.com/s/files/1/0431/0948/2658/files/13340133830.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/56474381983.pdf
    • https://cdn.shopify.com/s/files/1/0436/9465/3595/files/walamive.pdf
    • https://cdn.shopify.com/s/files/1/0438/8113/6296/files/dynamic_business_law.pdf
    • https://cdn.shopify.com/s/files/1/0443/5532/2012/files/bemikumusiguxelejofaba.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/46709480601.pdf
    • https://cdn.shopify.com/s/files/1/0430/3742/5818/files/68962050877.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/20859352472.pdf
    • https://cdn.shopify.com/s/files/1/0429/8099/9321/files/how_to_continue_numbering_in_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/77498951832.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607b.bin
06eddbd4c8728db69067bbe41797f9fd4d49d6b09a2a92ce6dfc2dd982babc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607B 4920 bytes
font_01_sfnt_off00007119.bin
1970edb00bbd2d961421328f77f96b78fa34402e356cbadf6737d0a95fc0b59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7119 10516 bytes
font_02_sfnt_off000094b9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B9 4324 bytes

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