Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cff7375b6d6f3dc…

MALICIOUS

PDF

58.3 KB Created: 2020-08-17 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a36aa9fbcf8f4f4f15dd6a0f4d03ff9 SHA-1: 4939185a28da6c1e9251a13279c152ddc116f428 SHA-256: 4cff7375b6d6f3dc03af92fcbebd5f39872c29f92cfd5e2b12374346bf810a21
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from various sources. The primary malicious URL identified is https://ttraff.ru/pify?keyword=oreiller+orthop%25C3%25A9dique+%25C3%25A0+m%25C3%25A9moire+de+forme, which is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to orthopedic pillows and mentions wkhtmltopdf, indicating it was likely generated by a tool rather than authored directly. 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=oreiller+orthop%25C3%25A9dique+%25C3%25A0+m%25C3%25A9moire+de+forme
    • http://files.elmbankrabbitboarding.com/uploads/1/3/1/4/131437660/pafoxeku.pdf
    • http://files.funnyfarmanimalsanctuary.org/uploads/1/3/0/9/130969873/vugorozuzomalomowo.pdf
    • http://files.fcband.org/uploads/1/3/0/7/130775511/6598971.pdf
    • https://cdn.shopify.com/s/files/1/0431/9150/0961/files/advantage_and_disadvantage_of_internet_essay.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/fugim.pdf
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/jefisukuwoluta.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/78213390247.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/xobirejapitimarudofa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/leruwolaxopo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/how_to_create_a_subset_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8106/files/joxupisasawuzetifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3143/files/80432416425.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/63272937800.pdf
    • https://cdn.shopify.com/s/files/1/0450/7978/9733/files/mental_ability_test_ustet.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/60672580512.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/maury_lie_detector_meme.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fb4.bin
bc2281d609f3504521c898a61be049c66063da1201edaa62d072b8d013f1e3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB4 5424 bytes
font_01_sfnt_off000091b1.bin
efe964cc7e614d2a8020c48da1521d877f71037abc3c21c9d457be55334e1105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B1 2668 bytes
font_02_sfnt_off00009d61.bin
e5a4d38e75150f0a3765c007e7f2ad52f7531829f2fb10be8d36dbcfeb811f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D61 12076 bytes
font_03_sfnt_off0000c371.bin
f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 16344 bytes

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