Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dde42feab803d0…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 13:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0c2a49671f1604d32c027d90a60b20e SHA-1: 2222039f5b240f9b003b41809488ff87bd53b462 SHA-256: 18dde42feab803d0d5bf591f7b28b840a6aefb67d2653e5950c898aba1b68f5d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=low+voltage+circuit+breaker+types+pdf, which is a critical finding. The presence of many external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=low+voltage+circuit+breaker+types+pdf
    • http://fifas.revartmontana.com/uploads/1/3/1/4/131482995/felifutagefilolu.pdf
    • http://files.silverlining-press.com/uploads/1/3/0/8/130814286/vovomexutosiko.pdf
    • http://files.tamraspradlin.com/uploads/1/3/0/7/130776225/5242651.pdf
    • http://files.mybestdoodle.com/uploads/1/3/2/3/132302982/gazeza_mikoziderezetef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/zelagukenupufovedoves.pdf
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/xevegenuvomifowuwuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3006/files/tixasedikuleduzowotavubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/86538063989.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/amlodipino_efectos_adversos.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/63835883207.pdf
    • https://cdn.shopify.com/s/files/1/0450/0701/1998/files/memories_of_midnight.pdf
    • https://cdn.shopify.com/s/files/1/0439/9661/0718/files/77043354009.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/27725154878.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/sartorius_muscle_stretches_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/32071916570.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46506788711.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_off000063fa.bin
d3cdcb56d4fcddd507f7b0699be83207ff2f0b8a350e24f06a2e9fd4ce3eadfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 5724 bytes
font_01_sfnt_off000077a8.bin
475fe877242596fc6395cc93b61d56627f7a08b173dfe418350dc8e4bf0950ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A8 10080 bytes

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