Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2d767a8a2a4a11…

MALICIOUS

PDF

38.9 KB Created: 2020-08-20 05:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bbb9c4e73b39ec161065f478387862d SHA-1: 042635a141b79e77be047aba4110999373ad666b SHA-256: 5a2d767a8a2a4a1103b7469c5820fd6ae6412ba7f9ac2a7ba1f65b8771fe3e1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one pointing to a known malicious redirector. The ML classifier and heuristic firings strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to the malicious URL and a large number of other PDF links, suggesting a link farm or redirection strategy.

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/pify?keyword=german+shepherd+dog+image
    • http://loxefos.ipswichhumanegroup.org/uploads/1/3/1/6/131637814/golesefalato_tuvabizatujid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3218/9860/files/all_ansible_commands.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/28796523951.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/baby_girl_photos_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0438/1186/4738/files/acuerdos_comerciales_del_peru_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/alamelumanga_alamelumanga_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/30832977558.pdf
    • https://cdn.shopify.com/s/files/1/0435/0260/0356/files/36956505221.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/40706008459.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0152/files/26775684554.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_off00005ac9.bin
1dd81ab1d31489803f7146dcbb1f86e7debd3f6a2d2568e0a2a38b82912a9eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 5372 bytes
font_01_sfnt_off00006ce2.bin
0d8c1534c6e3c145544c9754d4dc69d0d9003e848863809358aad1c9a085da3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE2 10060 bytes

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