Malicious PDF — malware analysis report

Static analysis result for SHA-256 2661c7c5f6f5fc88…

MALICIOUS

PDF

53.6 KB Created: 2020-08-03 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91524a4f927adc756b9506650377b36 SHA-1: 84ee58e8e6e53303e732208ad90fd31771b4939d SHA-256: 2661c7c5f6f5fc88d298933451331793efbee1677b3d5440d3cf46d11aa030a3
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, specifically pointing to 'https://ttraff.cc/pify?keyword=bacterial+wilt+of+banana+pdf'. This URL is designed to redirect users to potentially harmful content. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=bacterial+wilt+of+banana+pdf
    • http://files.kingcountyexplorers.com/uploads/1/3/1/8/131857983/bemuparasi.pdf
    • http://files.givingsquared.com/uploads/1/3/1/6/131637218/kolib_gevubululivoj_gopugopu_pagedibaro.pdf
    • http://files.mentortextswithlynneandrose.com/uploads/1/3/0/7/130775837/napawotawo-ganetebakozote.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/83040519040.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/juluxumukategusegisufogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/dizotusisawuwawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/59760445986.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/20159721264.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/86779813728.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/12906046584.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/nuwekarimadalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7770/files/farisojavodeboriwepeweju.pdf
    • https://cdn.shopify.com/s/files/1/0436/9360/5014/files/vigezegubakejipesajak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/fitur.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3432/files/fowowumifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0802/2938/files/97680273032.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/54437537772.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085ba.bin
e596af96150522246236756e356c093e12b2e0b8e6ea3ca8944877426a65adab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 5040 bytes
font_01_sfnt_off000096e9.bin
7c64fcef0e6a56d458f563b39e4e11807dc5d2a6f0523f96e81d692a340509b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E9 10528 bytes
font_02_sfnt_off0000baac.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 4324 bytes

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