Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ba6129464b787c…

MALICIOUS

PDF

44.3 KB Created: 2020-08-18 15:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f35d86da4f2dacf5340f4694b885664 SHA-1: e10b10212c275a050951d74ce8281d9763c26329 SHA-256: c7ba6129464b787cc072b6a604551dda9006079811da573460458e2bd6f10974
120 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=avast+antivirus+offline+update+file+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Avast antivirus offline update file free', suggesting a social engineering lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=avast+antivirus+offline+update+file+free
    • http://xotevum.eventsattcmu.com/uploads/1/3/0/9/130969742/31d136c45.pdf
    • http://xomizobet.pjpexotics.co.nz/uploads/1/3/2/7/132740405/4181808.pdf
    • http://files.armbrustacres.net/uploads/1/3/2/7/132740204/6fc1fbf9d.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/osrs_hunter_calc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/64579623103.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/nelibezuwarewamene.pdf
    • https://cdn.shopify.com/s/files/1/0450/6848/4758/files/ad_art_bkprmi_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/1711/7589/files/26726136565.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6589/files/55657927830.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/kidilajexibajuvajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6794/8708/files/berlitz_basic_french_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/semi_automatic_capsule_filling_machine.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/gimoravadagufimis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/dililewobubararedezeli.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_off000070f1.bin
a64ce2c6ab3f5136a26bcbeb5d1ce09ce6934e4128284849ea45ef74265619ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F1 5084 bytes
font_01_sfnt_off0000824f.bin
5ab72cd877b6c75e44353fe0bcc9a4c12435ac5b5e7d866f1db1db65720d703d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x824F 9988 bytes

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