Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f54fec975928830…

MALICIOUS

PDF

39.2 KB Created: 2020-08-29 15:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a60f0ad223f29cb3fb137dc6b2594767 SHA-1: cbdcefc93d346b2830d8ab7526f959fa12b0359f SHA-256: 0f54fec975928830c4d74d9885ff654e54ffeb07dda29a4201f994a195a671d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is part of a link farm of numerous other PDF documents. This suggests a tactic to manipulate search engine results or drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=dinamica+sobre+sexualidade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/momewonilerepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/93300145971.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/calcium_hydroxide_with_iodoform.pdf
    • https://static.usrfiles.com/ugd/b8c837_0675bf0d342c4dc788b86726e2943cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_250efd67a331445ab6d6eff729935873.pdf
    • https://static.usrfiles.com/ugd/b8c837_503efc8152634a04a3a77f07d1e15659.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2f1240777aa456b9c16e3773d05e523.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1b8159fcebe48d48f88a7acf33642f4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/romance_bollywood_movies.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/52008671707.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_off00005a0e.bin
8ab94a7d64069258c506c4a3c747c06b175be52331f3674c00ddae6031b99152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0E 5292 bytes
font_01_sfnt_off00006be1.bin
402b6e76a4aa9a37acc3ab868ef62a2b2029615d159e1329c1037c8564a43d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 10672 bytes

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