Malicious PDF — malware analysis report

Static analysis result for SHA-256 7199a50f56b6119a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-25 19:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af8cf465439f6cbb15877840834da507 SHA-1: 554cb9abc01bfe8f9321193102a6b0d79d068a32 SHA-256: 7199a50f56b6119a795c0aab5e2dfd165c3071e7f502a89ec69bd28b898a2d98
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 of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=civ+5+difficulty+levels+multiplayer', is flagged as malicious and likely serves as a redirector to further malicious content. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection attempt.

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=civ+5+difficulty+levels+multiplayer
    • http://files.lbennett1039.com/uploads/1/3/0/7/130776162/1bb9a.pdf
    • http://numide.mainlinepilatesandyoga.com/uploads/1/3/0/8/130874631/1782225.pdf
    • http://files.standardtimewatchrepair.com/uploads/1/3/0/7/130775506/goxop-xunenopidi.pdf
    • http://files.industrialinsulationsupply.com/uploads/1/3/0/8/130874160/fowibulamak.pdf
    • http://surisat.michellelewisphotography.com/uploads/1/3/1/4/131438110/revivudidenoz_kuzuzefejaluso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/caribbean_food_groups_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/cooler_master_hyper_212_evo_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/liguvoxutetinamejirerozeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/fopufisunowixajuxodorarum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/fusaxenokigitanaduwasogod.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/46167634276.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/2026375874.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/48917236436.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/4528774241.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/28779290814.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/7268517624.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/sarakapusigew.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/virtualbox_mount_shared_folder_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/pipimijovubunawoso.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_off00006552.bin
155b47161cbe6a1398e8f02cb9b9abfd8d9af56e8b466b9f5d5b397c90fa976f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6552 5492 bytes
font_01_sfnt_off000077f7.bin
60201cfc71f3e3aacefd9b7a78214733e9db68d7fdc9d8c778fa8e7149603491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 9920 bytes

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