Malicious PDF — malware analysis report

Static analysis result for SHA-256 83087581708aa598…

MALICIOUS

PDF

55.2 KB Created: 2020-08-10 04:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff788abe4a5206d398e7858952c0167 SHA-1: 06156312d0484e58b56ae525ded537c45f8e776c SHA-256: 83087581708aa598f67d984900970f2461bab8299cfe508a27d3f5f90a90eddf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.cc. This suggests the document is designed to redirect users to malicious sites. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS flag further support a malicious classification. No scripts were extracted, but the document body itself contains URLs, indicating a phishing or redirection attempt.

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=journal+el+khabar+pdf
    • http://files.thevitalitycafe.com/uploads/1/3/1/8/131857402/1305194.pdf
    • http://files.cypbb.com/uploads/1/3/1/3/131379296/rizexeruxopajebun.pdf
    • http://files.sanctuarybytheseacounselingservices.com/uploads/1/3/1/3/131380717/nupijatumerisumozaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/cambridge_checkpoint_science_student_s_book_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/wojilinogitewajanari.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/92356420229.pdf
    • https://cdn.shopify.com/s/files/1/0437/0684/3288/files/jebigowelegedizozufano.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/fijisos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/62062547661.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/87979353376.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/alfabeto_griego_historia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/38058291484.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/mesugodib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/blind_spot_experiment.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ad05.bin
cda027486f28f79b75aaac9a4ae5f97326ce04ac5f0d40e75d722cab9cb5ad87		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD05 20568 bytes
font_00_sfnt_off00005865.bin
c9cf98c8ead738db4580d6c09a856ee3197174e0d7088e785f239306e9fa124c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5865 9908 bytes
font_01_sfnt_off0000781e.bin
83559fbc8bbef563077c46415733eae0d0d2c9c3f6d926289f3b695e15a40ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 5144 bytes
font_02_sfnt_off00008991.bin
5184ae79ce7ddce524a7b8213a28094b3dc05bff185636dc3877bdba84bb7259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 10408 bytes

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