Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf5889cb9517526…

MALICIOUS

PDF

48.5 KB Created: 2020-08-09 23:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f35af6328947d25395da3fb355ce2bf SHA-1: bd60918e76d1fe4e0ed0ec550c04159cc346f310 SHA-256: ecf5889cb9517526a9bfcdd0e4f944b388fded10c30fd31ad9e0e50be4f9d384
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body text, though garbled, suggests a lure related to an internship report, a common social engineering tactic. 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=avant+propos+d+un+rapport+de+stage+pdf
    • http://files.redhawksmusic.org/uploads/1/3/1/3/131379875/9513615.pdf
    • http://files.creativesprouts.org/uploads/1/3/1/8/131871605/6029380.pdf
    • http://files.allyruttanphotography.com/uploads/1/3/1/1/131164424/3986222.pdf
    • http://files.fwjga.net/uploads/1/3/0/8/130813134/wumag_kisisaxabutofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/46462555871.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/hello_goodbye_tyler_farr.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/66774768815.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/adobe_illustrator_cs6_myanmar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/reniwemoturirenivolov.pdf
    • https://cdn.shopify.com/s/files/1/0428/6867/0620/files/zejofunodir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/xopipitofepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/retaxokodebefide.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/pride_mobility_scooter_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/dosinapavaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/hampton_bay_outdoor_lighting_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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0c.bin
e0c31730531d2aba731e71e879f38184d7105154e5924b48dc77e41cd560d5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0C 5060 bytes
font_01_sfnt_off00007f4d.bin
c7672fe4659c9bb587a7c7fd1b753b61a47d5f5fe45ddaaa1889f804570e5030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4D 12116 bytes
font_02_sfnt_off0000a537.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA537 4324 bytes

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