Malicious PDF — malware analysis report

Static analysis result for SHA-256 77601c672cad7dd1…

MALICIOUS

PDF

39.5 KB Created: 2020-08-14 09:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ad2b6b6cc3a24afb3e84b8b6672a88 SHA-1: 4a692608c9835e13031330260972b3df8068426d SHA-256: 77601c672cad7dd15eaf9e1f505e01581f20ea94742144894be867d27aaddf59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to traff.com, indicating a redirection to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to data analysis and worksheet biology, likely serving as a lure.

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.com/pify?keyword=analyzing+data+worksheet+biology
    • http://majefiwa.joannaberesford.com/uploads/1/3/1/4/131453459/9512717.pdf
    • http://fawuti.creativetrekkie.com/uploads/1/3/1/0/131070189/jakumifiwef-nawoleden.pdf
    • http://files.relativesintheattic.com/uploads/1/3/1/4/131483200/xugefemetukokiralizu.pdf
    • http://files.accssfn.com/uploads/1/3/0/7/130776511/zotokuv-dokolazave-bedesul.pdf
    • http://files.designfea.com/uploads/1/3/1/1/131164295/fa66105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/zurivalidofodiwoniberebez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/pulp_fiction_synopsis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2293/2373/files/kuvaveroweb.pdf
    • https://cdn.shopify.com/s/files/1/0430/8441/5143/files/delukobajofurog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/46084303655.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/31506809410.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/3305048987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/dokomiwevarekemuxoniriw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/6953944243.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/archinteriors_vol_41.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/los_pasos_perdidos_alejo_carpentier.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/zumafiwetifotesiwuvetosok.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_off00005b3c.bin
8a6dae6a853fe1c7d8a37356bd0c2e50edc2a68f243f96ee7d5bd0dcaa241c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3C 5524 bytes
font_01_sfnt_off00006e16.bin
80bd8746deee67439f72815391f315df7150e52b586c14f7a90d4b2bf585cbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E16 10184 bytes

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