Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96bbb34d76749f4…

MALICIOUS

PDF

48.6 KB Created: 2020-07-31 02:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead2b9672de7f2179570b4c66814e395 SHA-1: 3dfc3cd5eb3cc77d99d259a6adb3d2833e589e67 SHA-256: f96bbb34d76749f4f92902cac4fb2164255923059e6168a4aa7b0b7a64634587
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating redirection to known malicious infrastructure. Another critical heuristic, PDF_SEO_LINK_FARM, confirms the presence of a large number of external links, suggesting a link farm. The primary malicious URL identified is ttraff.ru, which is used to redirect users. The ML classifier also 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.ru/pify?keyword=handbook+of+reliability+engineering+and+management+second+edition+pdf
    • http://files.gricua.net/uploads/1/3/0/9/130969080/682eb18a31b.pdf
    • http://files.brandonmoorecomposition.com/uploads/1/3/1/4/131438766/muxigem.pdf
    • http://files.awardsgeek.com/uploads/1/3/0/8/130874514/4325717.pdf
    • http://files.soccerwithoutboundaries.com/uploads/1/3/1/3/131383493/eb0938c.pdf
    • http://files.bharpermd.com/uploads/1/3/1/4/131438823/6173598.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/puwagerafinokotanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/9904245687.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/zevodibanijas.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/movizap.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/wedas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5625/0525/files/57033513546.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/45520435894.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/jimagotubusaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/xokesabaviwulamavasijidom.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/gulujapirudimine.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/99659463388.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/ralurabexoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/tizajesig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/52690223136.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/
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000744a.bin
22d14769c24f0610590d924d2048966ee3df13bf52b1d575fbf8c77ad7c4dba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744A 5528 bytes
font_01_sfnt_off000086fe.bin
9a7706e12d9ff12db4cc5e7222f4295b717411f67f8b68b1aebf4b22722ecdfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FE 14508 bytes

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