Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c85c4f28d71d3b2…

MALICIOUS

PDF

37.5 KB Created: 2020-08-30 07:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe3a8163c017f6f11a01af0811e6943f SHA-1: 659c523684951f775b16284d39982c7425fca13a SHA-256: 5c85c4f28d71d3b283dfe62bd82bce372e6f17371d49ebff90f92f51ff49056b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wix?keyword=solucionario+electronica+de+potencia. The document body also contains this URL and numerous other links to PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/wix?keyword=solucionario+electronica+de+potencia
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7d1dc9_6bcdd100c0ff4cf68487f9a1684f888d.pdf
    • https://static.usrfiles.com/ugd/3f80ec_aaa2d891a96a40e995184507bd516988.pdf
    • https://static.usrfiles.com/ugd/b8c837_47290f84890a4e0d8e292dde9666bc21.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/vibexeri.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/wixerexigoreto.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/busum.pdf
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/akademia_pana_kleksa_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/gisidabezuboxof.pdf
    • https://static.usrfiles.com/ugd/b8c837_6674ef1399d8477a92440467295144bd.pdf
    • https://static.usrfiles.com/ugd/07ef24_2230d7bf912d42a6933c016e625d7e1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_56651e16c1894a7dbea5127926c6d992.pdf
    • https://static.usrfiles.com/ugd/b8c837_a810709831414e44b54ec4ab61bb855e.pdf
    • https://static.usrfiles.com/ugd/158fb9_e77eee8d77a84eccb81024e8ca057f6a.pdf
    • https://static.usrfiles.com/ugd/6cf392_2bca818526154b75b03db75f8b8df923.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_off00005367.bin
ded08550739e5cf63edccf93c71aab212208b6e4f7796d960fe47b9adc36ced8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5367 4992 bytes
font_01_sfnt_off00006462.bin
c258126c52391bb66174a28ab31f01dbe66f415c6b14641b3cfb3551c7db1403
pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 11264 bytes