Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9c4bd77aad5b21…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4708d26d7f6dcbb4c142ca357b71fed SHA-1: 42867f3aad630446208bbd37084de2b3c5a1a542 SHA-256: 4e9c4bd77aad5b217c77628afeb251b8f7709a64c5f73dc723976f9611f98a67
150 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same URL. This suggests the primary purpose is to redirect the user to a malicious destination, likely for phishing or malware delivery. No scripts were extracted, and the PDF structure itself did not reveal further malicious intent beyond the embedded links.

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.cc/wix?keyword=mad+max+unlimited+scrap
    • https://static.usrfiles.com/ugd/dc8a8e_8ebdcec16b3d4dc9a9dbf375a7c5f215.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca7214c10c1b47438db081708e9ff2ce.pdf
    • https://static.usrfiles.com/ugd/6116da_7c2f058392c94f63aa0aab3893328437.pdf
    • https://static.usrfiles.com/ugd/cac9e4_90fee3d73f0b452a9c5919b13c222d61.pdf
    • https://static.usrfiles.com/ugd/eb4c03_dc116eec93c34497a22095b0872145aa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0747/3821/files/96231084912.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/addiction_procrastination_and_laziness_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/siguno.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/complications_of_meconium_aspiration_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/eclipse_free_for_java_ee_developers.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_off00004bd6.bin
326a3aa5a44e68e54967b99e0d21f2de50ca6f4f1b19beb10453dffe7c8df229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD6 5292 bytes
font_01_sfnt_off00005dc1.bin
dd22ab731fc6463bd5103b081be84faae677d68cd2b6f857eef50cc707aa5076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC1 9928 bytes

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