Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f90385b5517709…

MALICIOUS

PDF

53.8 KB Created: 2020-08-10 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f594448f52d64ef39488a28cf166930b SHA-1: fc0cce299a630523c0d9d79e7671208bcc122029 SHA-256: d9f90385b5517709663a174795be4e2daf0da4a9826d9a4d647ddf7e4c0c9485
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, which is indicative of a link farm or SEO poisoning attack. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=assessment+center+f%25C3%25BChrungskr%25C3%25A4fte+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, reinforcing the lure-based attack pattern.

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=assessment+center+f%25C3%25BChrungskr%25C3%25A4fte+pdf
    • http://files.babywhoopsie.com/uploads/1/3/1/1/131164402/sadewapekuraxib-vevetire-wodoz-torel.pdf
    • http://files.power2motivateme.com/uploads/1/3/1/3/131378990/warexife.pdf
    • http://files.botanicalchildren.com/uploads/1/3/1/4/131437087/3779083.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/livre_d_orthographe_franais.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/sisosejubar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/kotixesisijuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/65019481236.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/12637298410.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/carnival_phantasm_op.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9970/files/97069266451.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/chloroplast_genome_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/tizasepesikuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/borrow_vs_lend_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/12351332629.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/piwarawutinewokoxiguji.pdf
    • https://cdn.shopify.com/s/files/1/0440/4045/4294/files/18640858303.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b5d.bin
1bdf4a131545051e73fe2c72823cf560763e40c1b18a6f9137903c233bb115cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 5736 bytes
font_01_sfnt_off00008e77.bin
7270cde59a76eee8b3153cf8706b07379faf0f7c6c41a889c7bcbb024bb86f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E77 11192 bytes
font_02_sfnt_off0000b335.bin
9065dbc6154a30e064f5b750d4b12464706f21ef18449ce5c48e12724f01b265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 16084 bytes

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