Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3773e4f2fa55441…

MALICIOUS

PDF

54.0 KB Created: 2020-08-07 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14c15976c626b3364a6ddc31b7981af SHA-1: 44a2be3c9cf3a4717c058c197b8ec11ec80ba426 SHA-256: a3773e4f2fa55441f4ed0ce4b7dc991130bdded14a320911d92839b46908726f
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to external PDF files, indicative of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=cancionero+catolico+con+partituras+pdf', is identified as a known malicious redirector. The document body contains garbled text along with the malicious URL, suggesting an attempt to disguise or obfuscate the malicious intent. No scripts were extracted, but the primary attack pattern appears to be SEO manipulation and redirection to malicious infrastructure.

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.cc/pify?keyword=cancionero+catolico+con+partituras+pdf
    • http://files.patriciavillalobos.com/uploads/1/3/0/8/130813860/juxavasetinejo-widini.pdf
    • http://files.pilotcomics.com/uploads/1/3/0/9/130969663/raduwidekula.pdf
    • http://files.myfathershouseworcester.org/uploads/1/3/1/3/131379946/11d7caa3fa294d.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/75194593439.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/60194266101.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/candide_ou_l_optimisme_en_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2874/2298/files/gukolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/fopafikutujogagaxubelekil.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/zufanisanawojuwez.pdf
    • https://cdn.shopify.com/s/files/1/0432/9780/0350/files/tukowosupub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nojigepinipefonumupitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/megetozegewib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7206/1591/files/begegututiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/melev.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_off000087fe.bin
4e96b0db483072e0cf072559bbef0a6e798215e58301a7190ac58f0c2747795e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FE 5052 bytes
font_01_sfnt_off00009936.bin
b45c523c6b20696e94893b18e3ac7c27acb58d27f8dec9222d8a2ad2a06e6cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9936 15992 bytes

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