Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dde9e783fa16919…

MALICIOUS

PDF

65.1 KB Created: 2020-08-08 07:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98df3dccdd86cf25ba1f0dfe9943e22 SHA-1: 90b000e823e5dba85cdabc50161155edd8c1f542 SHA-256: 4dde9e783fa1691979d61fef7e3196f1be8f3ab00453af1f3bfcf40bb5a69c97
152 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.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=acoustic+neuroma+pdf', suggesting a lure related to medical information. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy for SEO poisoning or traffic generation. The ML classifier strongly supports the malicious nature of this 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.cc/pify?keyword=acoustic+neuroma+pdf
    • http://diselezi.steinwaywhisperer.com/uploads/1/3/1/4/131482975/8370170.pdf
    • http://files.silverdollardogs.com/uploads/1/3/1/8/131871605/d43090b354.pdf
    • http://files.wearesrta.org/uploads/1/3/1/8/131871699/digudarin-fobunitatuniwi-panevi-lezumikopuso.pdf
    • http://files.lightingcreativefires.com/uploads/1/3/0/7/130739833/da7ebb9d.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/kewetanavivotuporuzero.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/15126728593.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/37739720697.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/english_story_for_learn_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/zujema.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/home_depot_grants.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/pdf_to_dwg_converter_free_download_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/nagisadulaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/10241748880.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6167/files/25012138460.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/assembly_language_programming_and_organization_of_the_ibm_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/1014/6983/files/14378655905.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_off0000c1ed.bin
c317825da13b379cad73e8c1212b46e620b35ec5831ba6913499d8c32290072a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 5260 bytes
font_01_sfnt_off0000d3b7.bin
eb4865834d2c47d11c9873abfaa4bd7bdcb82fa3522f80a0882eb66959def740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 10380 bytes

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