Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d285d3cb7dd92e4…

MALICIOUS

PDF

45.4 KB Created: 2020-07-21 18:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd79b78b23cb91a0fe0fb99a94a37921 SHA-1: 6e20aa4216a9685f292e90d6eaad231e459c3d9a SHA-256: 0d285d3cb7dd92e4cfec15d8202a3160b22eae35bdfed39922fd8fd831bbc104
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector at ttraff.ru, which is likely the primary malicious payload delivery mechanism. 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/wb?keyword=capacitor%20in%20series%20and%20parallel%20formula%20pdf
    • http://files.emilynotman.co.uk/uploads/1/3/1/4/131453132/7727521.pdf
    • http://files.lindajluna.org/uploads/1/3/1/3/131384635/9441370.pdf
    • http://files.docstover.org/uploads/1/3/1/4/131406807/7091268c0e3543e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/51094859682.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/jixosegodojulimapetojil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/tiwezuvedevixolemadolal.pdf
    • https://kiwuzuk.files.wordpress.com/2020/06/dipekujokagivukubawunif.pdf
    • https://masewow.files.wordpress.com/2020/07/rapazedugezikekadowa.pdf
    • https://gunobuw.files.wordpress.com/2020/07/62087693823.pdf
    • https://dejekakorox.files.wordpress.com/2020/07/mageriduguvewapiw.pdf
    • https://roronenajuxi.files.wordpress.com/2020/06/gezovukixedugigen.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/risopoxorizinu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/96504168154.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/wivafizokemalubazinomub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/22409625273.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/badunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/35986164395.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/jinukivalodiloluzalizes.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_off00006f31.bin
9be38196349aba9722e8896c0e97d22c524ffeb3206cdb9b2dc1b311f857a99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F31 5208 bytes
font_01_sfnt_off000080c4.bin
b07b676d9aeab28d2da9839012a2f74bceed05345accf272d1bb9bd27f87c9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C4 12056 bytes

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