Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8742bad6d3197e…

MALICIOUS

PDF

43.3 KB Created: 2020-07-28 17:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2e79d31cc1e97bae7f3fb591d13eb0 SHA-1: a89af249abbe7c16eab95aea3704df47b1bf5af2 SHA-256: 0c8742bad6d3197ead7833933e53177a93fe99135159135222b1fe396e01a660
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 the primary redirector URL identified as malicious. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting an attempt to manipulate search engine results or lure users through deceptive content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

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=kappa+trousers+size+guide
    • http://files.saiddeek.com/uploads/1/3/1/4/131453494/waminamonuded.pdf
    • http://files.jazzdbell.com/uploads/1/3/1/1/131163960/3618122.pdf
    • http://files.affordablecreditsolutions.net/uploads/1/3/0/9/130969371/sexadataxosu-bozowapaduvomi.pdf
    • http://files.scottwolfguitar.com/uploads/1/3/0/9/130969971/sisez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/sevidiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/zafovefuvib.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/subav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/kusikaluni.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/leponefefilejemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/rolarutozonupikiwesimete.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/xemivajodubepefite.pdf
    • https://cdn.shopify.com/s/files/1/0436/1040/7069/files/wakugabuzipugepevej.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/63522833231.pdf
    • https://cdn.shopify.com/s/files/1/0438/4279/7730/files/gadiximupob.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/84347829108.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/gufoliketik.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_off000060ac.bin
2e901fd00e0d2b6b2fc4946bf29bf0995966b9c5c57096f1e38c9c7c7b89c4e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AC 4888 bytes
font_01_sfnt_off0000716d.bin
c5ff76191dc3d4ba28b29e2b3cc9d38f4dc97041246f54c6b4404c795ea84e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 15700 bytes