Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c82f6b7d9be71ba…

MALICIOUS

PDF

37.0 KB Created: 2020-07-30 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb7488279b948118a4c124c2e70d51cd SHA-1: b5bd4f61a0fe1d30576e66d8e5e6cad2477369cb SHA-256: 4c82f6b7d9be71bad23522fca41627e473e4e05d4558f0166bee4b082cb35c91
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm heuristic, indicating a mass distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'piano score'. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be directing users to a malicious site via the embedded link.

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.com/pify?keyword=ballade+pour+adeline+piano+score+pdf
    • http://files.shophenryandson.com/uploads/1/3/1/8/131871602/5400052.pdf
    • http://files.southbaytrailchallenge.com/uploads/1/3/1/4/131407695/ruruwoxagexot.pdf
    • http://files.newra.org/uploads/1/3/1/6/131607712/jixube.pdf
    • http://files.adventuresinfaith.us/uploads/1/3/0/7/130775249/5e924be.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/60183578138.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/68328599111.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/xupuwijilevus.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/11863903748.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/72515162820.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/78183251032.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/pumulidimonazesadatine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/pirafebaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/gomevidumalinuvekuzamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/30564506397.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/97151228813.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/resetejujunikeperaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.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_off00005624.bin
7087a05cf0dd0d548f270a6c55af3de21491e771424f10bbebe8f1b0f16ae066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5624 5000 bytes
font_01_sfnt_off00006722.bin
6bf6e12a411533e84b7e812ec29d2775f4a7300d6abc0267c8eabe3f509ce281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 9272 bytes

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