Malicious PDF — malware analysis report

Static analysis result for SHA-256 38faeb4b0dea5178…

MALICIOUS

PDF

52.9 KB Created: 2020-08-31 04:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 279203eec8c2c2fd089542af13b79cf4 SHA-1: 5edd68468ef4cb2082af19e3cd48addd4d1849f5 SHA-256: 38faeb4b0dea5178915738d770e59abff387aa21c351d2974d0519bc3a0c9007
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 26 external PDF links, many of which point to benign content on cdn.shopify.com. However, one critical heuristic identified a link to a known malicious redirector at `https://ttraff.cc/wix?keyword=lekil+vava+%25C5%259Fark%25C4%25B1s%25C4%25B1+indir`. The document body, though heavily obfuscated, contains this malicious URL and other benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=lekil+vava+%25C5%259Fark%25C4%25B1s%25C4%25B1+indir
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/shear_stress_and_bending_stress.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/35078797519.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/16211362968.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/54334067721.pdf
    • https://static.usrfiles.com/ugd/b48b60_86f6b4a992de4e01a69a9f391e9b4228.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_bff91dc397664208b6fe0ef3a5fc4004.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f0769e4102485a8a3e32a7e1e7d435.pdf
    • https://static.usrfiles.com/ugd/451461_6a28342ded1f4bac89667e19a0fa175f.pdf
    • https://static.usrfiles.com/ugd/3bf302_da00e49d9c674b86908fcda9db12e407.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/series_65_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/dna_structure_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/96714284555.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
stream_006_off0000a0c1.bin
676c716820946110e8b70a4b12a925f114b1cc6cd64436b2c63200337f73a0c6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA0C1 20476 bytes
font_00_sfnt_off00005144.bin
c3ee17b9423bce2bde41dfbe280c141df3549c812497ba9b66ed325f0b72c63f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5144 3352 bytes
font_01_sfnt_off00005f59.bin
c76f79c41854dcbfee9fd4c0d3c56b3973a9912e862fa12b932fee2c91036d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 5164 bytes
font_02_sfnt_off0000707c.bin
26d0dec8408f8b6c08a8bea3047ab6f0c25a3166d6bcb999f8f228099c21c181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 15984 bytes

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