Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab92b596a7aa4e36…

MALICIOUS

PDF

35.2 KB Created: 2020-10-24 13:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcf8d26f58e22f144b764bb2a8a41577 SHA-1: 9a6719c2166b274b1e2fe7bd4c1475cfdf24cf24 SHA-256: ab92b596a7aa4e361d2be40bac2e86f1bfd0629a6192fee9f0859356a094141f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found by the heuristic. The presence of a large number of external PDF links suggests an attempt to obscure malicious activity within a seemingly benign link farm.

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://cctraff.ru/strik?keyword=homelite+bandit+parts
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/8548352.pdf
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/9647351.pdf
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/sawosatu.pdf
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f8c9d0a180ae.pdf
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f88a77adb3f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/carolina_academic_press_desk_copy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/59688699718.pdf
    • https://cdn.shopify.com/s/files/1/0492/4660/1372/files/goofy_goober_song.pdf
    • https://s3.amazonaws.com/widiku/xejazomise.pdf
    • https://uploads.strikinglycdn.com/files/591d27cf-0c10-4e2f-bc26-fb5ae96ea82f/fidivurusibobokugupawow.pdf
    • https://uploads.strikinglycdn.com/files/3a950ed6-e292-4bb9-9179-819c9697cdfa/97072979500.pdf
    • https://uploads.strikinglycdn.com/files/3c67b5fd-937d-42db-938d-9d2bd812bab3/99074011028.pdf
    • https://uploads.strikinglycdn.com/files/3b889fcf-a000-4101-ada2-293acedcdd96/pokaga.pdf
    • https://cdn.shopify.com/s/files/1/0484/3716/6230/files/12298940584.pdf
    • https://cdn.shopify.com/s/files/1/0268/7169/3500/files/womurosagixagufe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/keyboard_compatible_android_games.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_off00004bdb.bin
7cb892e2fb6e277e618cee82b25c1f2ab3d9e0157309fa6192fa00b593f209ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BDB 5208 bytes
font_01_sfnt_off00005d67.bin
24824d8d89b49c862039690f75a5acbe5bc5376074ecde06d63a0426fd5566e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D67 10100 bytes

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