Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cd29daadd4caa7…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 18:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aaeae6982a3f5cc8b6eb28105e6013d SHA-1: f99b8ce74f7bed5e19a557cd06cf22af695998b1 SHA-256: 12cd29daadd4caa7a7373c3cdf98b5b8cfd27f7022d0766355a5b298d847a55f
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 pointing to external resources, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=microbiological+assay+of+antibiotics+and+vitamins+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links, likely intended for phishing or malware distribution.

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=microbiological+assay+of+antibiotics+and+vitamins+pdf
    • http://files.damianshishkin.com/uploads/1/3/0/8/130813859/e5d96fc1613c.pdf
    • http://files.ohmylashuk.co.uk/uploads/1/3/1/4/131452750/605191c5a7da.pdf
    • http://wujon.milfordmagic.com/uploads/1/3/0/8/130814328/5478509.pdf
    • http://files.chino77thcavalry.com/uploads/1/3/1/8/131857920/ea060c9a4.pdf
    • http://files.noeleencosgrovemusic.com/uploads/1/3/1/3/131398308/luterejokari-domejisanululor-tozaxubirofox-jifukisatusiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/annotatings_in_onenote.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/92243172254.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/22681214339.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/vezokinojasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/meririsobuvojavexiwolimaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/31140053382.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/90295808971.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/fujamoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/8178/4726/files/las_referencias_bibliograficas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/28992657875.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/fukeferekesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5695/4518/files/jalixoju.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6861/files/27097421610.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.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_off00006f16.bin
e2e8b83898e3fcdbdae8ab4c9191a494f15ee3217c4adf73bacb89dc9c0f0089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 5780 bytes
font_01_sfnt_off000082ba.bin
e837248a2c6f3563d385da197702063c87f6a461c8337f85fbbf31f0d26d952c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BA 10040 bytes

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