Malicious PDF — malware analysis report

Static analysis result for SHA-256 09471a26fda10875…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 13:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e11dc17c733971c0dbcbc2e1274850b SHA-1: fef407110fecb90bf98c609f97b08d9f89c47f91 SHA-256: 09471a26fda10875bdb13522dff1542feb5d7b705b9c9e90b7745828d24388e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though partially corrupted, suggests a lure related to nutrition information, which is then used to disguise a link farm. The ML classifier strongly indicated maliciousness, supporting the conclusion that this is a phishing or redirection 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/pify?keyword=baked+potato+chips+nutrition+information
    • http://files.goblin-king.co.uk/uploads/1/3/0/7/130738814/863438ba.pdf
    • http://files.drjasonwilliams.com/uploads/1/3/0/7/130740011/jukovitopagawet.pdf
    • http://files.artistsalive.org/uploads/1/3/1/4/131482821/fotuxiw_midapaw.pdf
    • http://juzijika.anchorcounselingservices.com/uploads/1/3/1/4/131407057/zigudubugopigar.pdf
    • http://files.aloveliclass.com/uploads/1/3/1/3/131380354/pifijiraxa-bogusaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2251/5351/files/donugewef.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/luwutowukipubaferasedu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/82694630662.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/87820973254.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/sidney_sheldon_best_laid_plans.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/19805203972.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/18384896493.pdf
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/96696639711.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/99991321670.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/98824415791.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/systems_analysis_and_program_development.pdf
    • https://cdn.shopify.com/s/files/1/0432/7922/0891/files/xafipexujapidinemi.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_off000066cd.bin
639e68b06b5b022cdad7e69059f1da0a8672094a36d9bdbf095e86c74f0d47bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5476 bytes
font_01_sfnt_off00007939.bin
598ece2bded3228f4af3aaf155053863aa54510eb7030b162c8e9dd037b7e3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7939 10592 bytes

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