Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8c5a1ab9b3bbd5…

MALICIOUS

PDF

70.7 KB Created: 2020-08-12 01:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 345b60203d98fc80f4dab651e1a85d20 SHA-1: f4cc6ffc34d41e8f39bcb8569457962353b581d1 SHA-256: 2a8c5a1ab9b3bbd5b0d3383e3ca4e240a10586675547bc8bae6bb599150c3470
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL points to 'ttraff.ru', which is known to host malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to distribute the malicious PDF.

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=libro+el+criticon+baltasar+gracian+pdf
    • http://files.bethelpenclawdd.com/uploads/1/3/2/6/132683069/b230a64bb7eb.pdf
    • http://files.arabicwithnadia.com/uploads/1/3/0/7/130739525/ccc7ac1b87d4.pdf
    • http://files.overcaffeinatedcode.com/uploads/1/3/2/6/132681665/zisimig.pdf
    • http://files.grobrainparent.com/uploads/1/3/2/6/132680998/84eda.pdf
    • http://files.samrahhairandbeauty.com/uploads/1/3/1/3/131380288/woxokedurejasibolen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/33437225062.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/deruvexedesupamozudegil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/fikibawopedasixuvokumuraw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/wigapopaselukaroximew.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/gisugerataxalinutebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/igitabo_cy_amategeko_ahana_y_u_rwanda.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/85525984791.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/dipepesikowixodebe.pdf
    • https://cdn.shopify.com/s/files/1/0447/3297/3205/files/2586735537.pdf
    • https://cdn.shopify.com/s/files/1/0435/1826/3464/files/widomimonusagovi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3821/0205/files/fuzojuzizapegomop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/98074112171.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_off0000d1e0.bin
0c0ac85647b0a56a15c85249b47123ac55b75f681bb60f44953dd86b49ddaf91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 5404 bytes
font_01_sfnt_off0000e440.bin
730a7a08785ef4a4f18db313e7e47ba45f81b8c2217910e7b364e11c4274d4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 12084 bytes

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