Malicious PDF — malware analysis report

Static analysis result for SHA-256 df77e7f6b85f2c85…

MALICIOUS

PDF

33.0 KB Created: 2020-08-06 01:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8974107ca3dec2fde94a8edecf90607 SHA-1: 818f20d030c222a46ab93429bc1558bcf8d61638 SHA-256: df77e7f6b85f2c85c3f677a9d8af8174523d26453911caccabe12d8bc456e26c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though obfuscated, contains text related to technical documents and the wkhtmltopdf tool, suggesting a lure. The primary malicious link is https://ttraff.cc/pify?keyword=durability+design+of+concrete+structures+phenomena+modeling+and+practice+pdf, which redirects to further malicious content. The presence of a large number of SEO-optimized PDF links indicates a potential SEO spam campaign aiming to drive traffic to malicious sites.

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.cc/pify?keyword=durability+design+of+concrete+structures+phenomena+modeling+and+practice+pdf
    • http://files.loudmouthofsl.com/uploads/1/3/0/7/130739542/sewebanibul_naxigi_pakalulo.pdf
    • http://files.eastcoastawningsandblinds.com.au/uploads/1/3/0/7/130739204/1660944.pdf
    • http://files.corpuschristibrisbane.com/uploads/1/3/1/4/131454766/sepufumobitaw-doxiteliselevi.pdf
    • http://files.leonoressuite.com/uploads/1/3/0/8/130813317/nejoden-fajodu-pefufebobomoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8905/2316/files/dukobutulubosuxakadafano.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0434/3280/4504/files/xejaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dixiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3896/files/xetaviv.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/94194990711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/lituxofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/52931667546.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/vatogutisoxigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/tetudevunugumofi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3002/7157/files/89170213140.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044bd.bin
d766b545f9a91156063906b3e45b8248829184a9fa6dcc30e4598bf1cbec2264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44BD 5808 bytes
font_01_sfnt_off00005867.bin
f25a419bff8ddad092327bd6e371564bc4bdfddbac2d034277bf48a066e8242f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5867 8800 bytes

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