Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c58a376e8e8b771…

MALICIOUS

PDF

38.7 KB Created: 2020-09-11 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f07a9d16721d1c9a771e3c8c2087207 SHA-1: c9d3a8748719507b0cf690cc3afebd866a717cb6 SHA-256: 6c58a376e8e8b771801dbbcaadc719de20143ceec8de652997ea15619988d44d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest an attempt to drive traffic to potentially malicious or spam-related content, possibly for SEO manipulation or phishing.

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/wix?keyword=mainsheet+swivel+cleat
    • http://toxipo.legacycaengineering.com/uploads/1/3/0/9/130969690/f2a1bd.pdf
    • http://files.senoritacinema.com/uploads/1/3/1/3/131398251/nubogiriwe-timejixixug-sofodexafabogu-nadidasoza.pdf
    • http://files.taylormadebling.com/uploads/1/3/0/7/130776218/forutuvuzoxi.pdf
    • http://files.natickpegasus.org/uploads/1/3/0/9/130969758/zotupideg-kokekarejoxib.pdf
    • http://rexorot.jordanback.net/uploads/1/3/1/6/131606349/niduzekuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/6dcf04_5df31c78feb24b9fa77f83e234a7209d.pdf
    • https://static.usrfiles.com/ugd/544c7e_92ff938e394c488b88618d43ede472fa.pdf
    • https://static.usrfiles.com/ugd/f09a9d_b4969d7e24964a1084f1543ccec164be.pdf
    • https://static.usrfiles.com/ugd/5bb01c_577586226a674e4c8890065dc9c1288c.pdf
    • https://static.usrfiles.com/ugd/5438e3_d767bedaa6bc47c799270beaae131690.pdf
    • https://static.usrfiles.com/ugd/0c41e7_f3d80a7b8708423cb3da5c05242b58b4.pdf
    • https://static.usrfiles.com/ugd/173616_7ada20d81f5f4798aa830180597a317f.pdf
    • https://static.usrfiles.com/ugd/affb4a_64b73ac20bf7474e90b4ec80a0a6cdc5.pdf
    • https://static.usrfiles.com/ugd/b96e41_a1742ee5cef1433aaee75390b538f6f4.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/7604197043.pdf
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/35380337336.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/install_yarn_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/98663164449.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/gegemi.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_off000049be.bin
d0942f2ca0654768458085895da2ea2af9bc9df9a617ef208c28cdbe130833ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49BE 4628 bytes
font_01_sfnt_off0000597e.bin
c1a6e5e7952cd5decda0602724642961f7e00c86441c2190fb191ced4626dd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 12060 bytes
font_02_sfnt_off00007fb1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB1 4324 bytes

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