Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9f4d9039a3eeee…

MALICIOUS

PDF

39.5 KB Created: 2020-08-18 23:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5ed54993249125fc7a641458470422 SHA-1: 5d582c786d2a25407e24f00e248b3f4ade9b6e5f SHA-256: bd9f4d9039a3eeee41f515d52e4788422520530e5d4c7673cf5f447fe3046469
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=base64+to+image+android+studio
    • http://files.bradleylloydteach.info/uploads/1/3/0/7/130739351/1308313.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/gajupejot.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/9385577590.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/anna_maria_island_map.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/96427731713.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/54941012958.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/gurigakoporirazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/valojejadubegen.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/kebebutarelamopusotuzeko.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/seether_truth_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7396/files/79844351718.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/73455540093.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/system_analysis_project.pdf
    • https://cdn.shopify.com/s/files/1/0438/4011/0754/files/d_d_dungeon_master_guide.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_off000058fb.bin
2939549dbb80807de1a41c04bfefd555a2ef79eba8eb3909ca4a6b54a500b063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FB 5404 bytes
font_01_sfnt_off00006b43.bin
4234e1f7f288aee9dd1c47dc36ee6291706c60c74262c89276baeec849e60ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 11024 bytes

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