Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4c4acac1035127…

MALICIOUS

PDF

41.6 KB Created: 2020-08-11 12:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd8db5bcc2a62c596ba210abdf24a1e SHA-1: 0721c5bcf562d48ec5347469e48526cc219692f6 SHA-256: 0b4c4acac10351271b7df0046ba13142ccc955a47a69068a4e075600eecac22b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector, likely intended to lead users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests SEO spam or a phishing lure.

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.ru/pify?keyword=las+asignaturas+en+ingles+ejercicios+pdf
    • http://files.ygnaciocenter123.com/uploads/1/3/1/4/131437563/a3eb39086711073.pdf
    • http://files.ncmilitaryoutreach.com/uploads/1/3/1/6/131637168/2129055.pdf
    • http://romiz.odenhouse.org/uploads/1/3/0/8/130813866/4513224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/nadesorovuguresosunitima.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/70961335966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tutokufumetuja.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/harry_potter_books_bloomsbury.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8419/files/nakoker.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/16893071437.pdf
    • https://cdn.shopify.com/s/files/1/0434/4171/7414/files/chiro_9000_natural_form_mattress.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/19085522196.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/54727249179.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/ligabidulopemowupodu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3972/5470/files/43187814988.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/kreenig_snarlsnout_wow_classic.pdf
    • https://cdn.shopify.com/s/files/1/0448/4697/3088/files/humana_dme_prior_authorization_form.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_off0000617c.bin
5ac16f65bab113948fd33dcfd2af290ae9a5b0a8db56ff12148df39282e1781c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 5340 bytes
font_01_sfnt_off000073ba.bin
1e7167d08dad01b6f439dabee10bc51e339ae3d413322ab165047fb3ee3b7bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BA 11104 bytes

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