Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f3e2e80a1c4501…

MALICIOUS

PDF

50.0 KB Created: 2020-08-17 05:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5a38a74f504e18dcff08ffb48f0ce69 SHA-1: 292939099bb04257cf78cca737f9495dcf36b981 SHA-256: 14f3e2e80a1c4501067b2f1ca43213cdd7bf84155dbb88f52fa48931564a9c41
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure to install a browser extension or update, a common social-engineering tactic. It also hosts a large number of external PDF links, with one pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the observed social engineering and link farm behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=chrome+offline+installer++english
    • http://zefevumel.mtlclownfest.com/uploads/1/3/0/9/130969204/dedus.pdf
    • http://files.cpeessentials.com/uploads/1/3/0/9/130969558/jipaxifodi.pdf
    • http://files.aztrinitymusicacademy.com/uploads/1/3/1/8/131872273/6535066.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/99146216888.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0537/files/xurubimasoxigoxirozid.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/14188251134.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/ff14_hades_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/how_to_prove_a_function_is_injective_and_surjective.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/fanujaxolefemonepagipomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/situwogutox.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0598/files/27985971082.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/komamejag.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/63047666123.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/agisoft_photoscan_trial.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/kerazapovigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/48497769072.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000793d.bin
8c77b9fb2ce52f99160f1c07729b71ca57fb41ae25ada41cbdf2c4be683a6070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 4992 bytes
font_01_sfnt_off00008a08.bin
56d8a02cb38399be04d8c4b76cf61c306f348ddbc2f434c1614786e28ee9bb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A08 10088 bytes
font_02_sfnt_off0000ac9c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9C 4324 bytes

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