Malicious PDF — malware analysis report

Static analysis result for SHA-256 0042d74a855cf713…

MALICIOUS

PDF

53.5 KB Created: 2020-08-10 10:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 568f91498e24709a761b17e85b3bc4b7 SHA-1: 90e6b15fabdeefb8ed838ec4a7f8651ece5fe1c7 SHA-256: 0042d74a855cf71318dc796e5c61782f5585b48590d5ca76cb963589f16f2cae
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains references to the redirector URL and a large number of other URLs hosted on Shopify, suggesting a link farm or content distribution network used to host further malicious content. The ML classifier also strongly indicated maliciousness.

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=jorge+luis+borges+library+of+babel+pdf
    • http://files.samschaus.com/uploads/1/3/2/7/132740457/5eeb85.pdf
    • http://files.jeskare.com/uploads/1/3/0/7/130775653/komimirozaga-kakuwu-wazokepajaxuwol.pdf
    • http://files.kaylinscreations.com/uploads/1/3/0/9/130969508/4331906.pdf
    • http://files.aboundinlove.com/uploads/1/3/1/0/131069869/nipumifabolej_wibuvupekefile.pdf
    • http://files.jessicakaranian.com/uploads/1/3/1/6/131636692/pawifetunulolov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/rexapaxurelujul.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/vubikenusodarofiluvabep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/91913926696.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/33176846777.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/gapez.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/march_2020_calendar_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/72100951869.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pizejop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/36821755949.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/breadcrumbs_book.pdf
    • https://cdn.shopify.com/s/files/1/0443/8815/5558/files/technician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/burris_eliminator_3_manual.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_off00009167.bin
2342c328449f488eac9143619cbefc9c3a579338198911570c67f5334f071d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9167 5440 bytes
font_01_sfnt_off0000a3fa.bin
17eee0b21527dbf7273cbae527f3f075dc7c9761e754787de333470fc85d17e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FA 10560 bytes

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