Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2e7160dc685cb5…

MALICIOUS

PDF

46.3 KB Created: 2020-08-07 00:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe51516400622be192e0d3c8fbf0c82 SHA-1: 67fac0047763bf59ad2a9bf535b2be6c1d96943b SHA-256: fa2e7160dc685cb5d1db716e3c97d980c9e98f7eb72fde99318058ad69b0ddaa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=adobe+after+effects+cs4+tutorials+for+beginners+pdf'. This URL is embedded within the document body, disguised as a tutorial. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and a malicious redirector.

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=adobe+after+effects+cs4+tutorials+for+beginners+pdf
    • http://files.marilyndavidsonflatware.com/uploads/1/3/2/8/132814071/a1e6fb42a.pdf
    • http://gapovovu.hrcpobirthday.com/uploads/1/3/2/6/132681488/8739330.pdf
    • http://files.kyocreations.com/uploads/1/3/0/7/130775828/timezotiwebi-figetatizugel-jebimilulum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/13675585847.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/45075426950.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/35707405941.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/67637073508.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83142526711.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/16509022481.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/82783143438.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/27684990513.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/29878194145.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/34787064793.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/lupux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/cosmic_irony_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/baby_cloth_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/d_d_5e_fallen_aasimar.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_off0000763c.bin
16844b93cab3de5791535aa4f787bcddadc18addcfc3aadc3f00ad0a908c16ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763C 5540 bytes
font_01_sfnt_off0000892b.bin
403627b350153b0d0167d54c670d651aff6d0f3f8690eb50c380bbfeb3c15c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892B 10020 bytes

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