Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b074fade660f2e…

MALICIOUS

PDF

48.6 KB Created: 2020-08-22 09:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b28f71c7b75d7b4bf3eebb07684edb3 SHA-1: 0a61c1ce02ec15c8beea0499f8085940fe7022b5 SHA-256: c4b074fade660f2e15c28f39b9e935a99f218c99483d2480ff65f3be9a97e06d
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of the URL 'https://ttraff.com/pify?keyword=aquiferos+brasileiros+pdf' strongly suggest a phishing or redirection attack. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, likely to obscure the malicious destination or for SEO manipulation. No scripts were extracted from this sample.

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=aquiferos+brasileiros+pdf
    • http://files.teanauhelicopters.com/uploads/1/3/1/0/131070911/veranisozikam_fofagamowotiji.pdf
    • http://gozobofi.selffoundation.com/uploads/1/3/2/6/132682124/punejelar.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/gukize.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/63362624425.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/vofuxuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/information_memorandum_template_real_estate.pdf
    • https://cdn.shopify.com/s/files/1/0443/0246/7228/files/jb_lightfoot_apostolic_fathers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/10109572041.pdf
    • https://cdn.shopify.com/s/files/1/0432/4936/9252/files/72311207763.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/96294551088.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/mipumesolukovajar.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/90289247061.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texigusowemojegovivek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/9367992209.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007106.bin
257689d9dafdbfe13fa282678e101c9f31c94f96d76c8bc3daaa1c3442908c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7106 4988 bytes
font_01_sfnt_off00008203.bin
d8c7b279354c3f30cd60654ae409e87c4bb20a8aa46bec74bf294eebbd006bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8203 11096 bytes
font_02_sfnt_off0000a727.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA727 4324 bytes

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