Malicious PDF — malware analysis report

Static analysis result for SHA-256 499b707d9123b0ea…

MALICIOUS

PDF

34.7 KB Created: 2020-08-06 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d819fae997dfac9a81354177874e1b SHA-1: 4164d39c8e09a417e67564b3301d29eaeec3fd33 SHA-256: 499b707d9123b0eae664307c362bfb50177278434ac34f7642354fd2a6e9eb04
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, contains text related to a calculus textbook solutions manual, likely a lure to encourage clicks on the malicious redirector URL. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer malicious intent.

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.cc/pify?keyword=calculus+early+transcendentals+8th+edition+student+solutions+manual+pdf
    • http://files.shainavglass.com/uploads/1/3/1/3/131382387/gefagajof_zunufale.pdf
    • http://files.bhbl-lions.org/uploads/1/3/2/8/132814030/ac5f22409558b.pdf
    • http://xafoju.3counties.info/uploads/1/3/2/6/132695569/9592009.pdf
    • https://cdn.shopify.com/s/files/1/0434/7710/6838/files/40232037906.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/72404416617.pdf
    • https://cdn.shopify.com/s/files/1/0436/1181/6099/files/funciones_del_hemisferio_derecho_e_izquierdo_del_cerebro_humano.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5809/files/a_star_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/bavukupetat.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/2006_mitsubishi_galant_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5081/0014/files/42959259713.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/dazolemuxozava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0429/5688/2086/files/gejebixatanixob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/40667339336.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/77320680338.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000492d.bin
fad45d7b78ef44c1c1b9830bb93997b4d69785593fdc4b80a84b8af09581e38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x492D 5596 bytes
font_01_sfnt_off00005c0a.bin
8ec2103a9284dfd15d46842ef25d40716eaf18c312738632b1f126a7b6207812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0A 9660 bytes

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