Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4f2cd89111e7eb…

MALICIOUS

PDF

42.0 KB Created: 2020-08-20 18:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7925227c7b1b4582e84ffe26f0f477ee SHA-1: 87517812863f05048c00f8571f57530a024db4d0 SHA-256: 5e4f2cd89111e7eb37f9fb8d09c972ce8a1b5c8206bcdb1186b1dd99ffb303d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=auditor+general%2527+s+report+2016+zambia`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many of which are hosted on potentially malicious domains. The ML classifier also strongly indicated maliciousness.

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=auditor+general%2527+s+report+2016+zambia
    • http://kevifoxap.shoehutmgk.com/uploads/1/3/1/4/131437436/2323863.pdf
    • http://files.tormonbrothers.com/uploads/1/3/0/8/130813428/9326171.pdf
    • http://files.hinkinhistory.com/uploads/1/3/1/6/131606490/matapedevukasub_severulofoluva_ligunajodap_gevewefolefi.pdf
    • http://files.write-the-vision.com/uploads/1/3/1/3/131380847/tatexapija-pisisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/16195241892.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0294/files/1st_studio_siberian.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/zitajuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/chevrolet_aveo_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/rifinofamogeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7700/files/33444166708.pdf
    • https://cdn.shopify.com/s/files/1/0439/2147/3691/files/78124489779.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/32047900474.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/6014376.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/49362827662.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/xeninibofasefetomidovu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006670.bin
7f279864ae37d3d152413bd2af2f43b843a94c9c06ed9416e304b03309ea3e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 5972 bytes
font_01_sfnt_off00007ab9.bin
efeb9a4aefcaf90f9fca10ec3b2ce51375099094a33297561ff314424d3d0100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB9 9496 bytes

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