Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e1a7f421dea032…

MALICIOUS

PDF

45.4 KB Created: 2020-08-23 00:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 647b03aee78d6b2b292a243014b86f21 SHA-1: 5fc121c5027ab99d63680b16f1e20207ea39846c SHA-256: 09e1a7f421dea032c3bd9f67c455e942b4edb833e48fbad0c31091c0efba8815
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=popular+music+ringtones+for+android'. The document body, though heavily obfuscated, contains a reference to this same URL, suggesting an attempt to trick users into downloading potentially malicious content under the guise of ringtones. No scripts were extracted, but the presence of multiple malicious and suspicious URLs indicates a phishing or redirection attack.

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=popular+music+ringtones+for+android
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://geridiv.tightandtidyplumbing.com/uploads/1/3/1/8/131871655/5899431.pdf
    • http://files.maryanndipietro.com/uploads/1/3/1/4/131453106/vemogidewo.pdf
    • http://files.jameslpoole.com/uploads/1/3/0/8/130873769/zuginumaxaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/zoderusutukudubiwobav.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/70582149454.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/7703814550.pdf
    • https://cdn.shopify.com/s/files/1/0433/2139/3320/files/igcse_math_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/72107376243.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/tepagosoxifuvaxivawabena.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/49470142824.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/xemubunuritaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/bending_moment_equation.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/kokino.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/animal_farm_by_george_orwell_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/nedinarupar.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/tikupatokizozuvafiki.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_off0000720a.bin
51103fd673ff8041077d7a9a2adc408b5042fe9fdb5876e833129b8fec40bf84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720A 5476 bytes
font_01_sfnt_off0000848a.bin
a4280563082a8e14be1331260789c4c8c321e3eeb007829480ad229f2cb2d772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 10352 bytes

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