Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f4f5479d1a5ae…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 21:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded619ebfd069027e99b96fe02aa470f SHA-1: b06ca012b24a4e95b11909f1684441913a8da16a SHA-256: 5f8f4f5479d1a5ae665c2ca6a446d70a557dd9a351d9caad98bee980307e4927
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the primary links, 'https://ttraff.com/wb?keyword=alistair%20maclean%20bear%20island%20pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, reinforcing the lure. No scripts were extracted, but the presence of malicious redirectors and a large number of external links indicates a phishing or malware distribution attempt.

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.com/wb?keyword=alistair%20maclean%20bear%20island%20pdf
    • http://files.strengtheningtransitionsincare.com/uploads/1/3/0/9/130969573/nedopivotumurafov.pdf
    • http://vimataroz.pebblebeauty.com/uploads/1/3/1/1/131164239/megojume.pdf
    • http://files.seasholmen.org/uploads/1/3/1/1/131164479/176d406587.pdf
    • http://bavalof.highcountrysportingdogs.com/uploads/1/3/2/6/132681946/9130124.pdf
    • http://godiraf.essentialfocuscoaching.com/uploads/1/3/1/4/131437308/5647077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/xokagudakozixusuxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/kumupafibofuvoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6841/5400/files/yield_management_cours.pdf
    • https://cdn.shopify.com/s/files/1/0436/2331/7662/files/remebolelupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/fobij.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/python_print_newline.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/wings_of_fire_bengali_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/suvaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/sanomopurexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/iron_deficiency_anemia_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/sewaru.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_off0000776c.bin
a35c566562e46738e2c15e301e6e394b6a009727dac84fdb9d765cdd7368e338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776C 5432 bytes
font_01_sfnt_off000089b3.bin
b890feaf13673d40a1a0350fe2c5f884d53f7a558c7a4bbc540bd445698ade7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B3 9904 bytes

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