Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21871563fba6d85…

MALICIOUS

PDF

43.2 KB Created: 2020-10-12 05:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cc211b3681648ada9b7687b985cb3630 SHA-1: ef4a5b19a6b7b32c3c19f7c696c4f40509453f2c SHA-256: c21871563fba6d85fe80d5bdf0e7442331c1adf61d4fae0566797471cca7e308
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=fancy+pants+3+unblocked+games+66+at+school In PDF document text
    • http://files.andreanocerino.com/uploads/1/3/1/3/131381991/09a9a68d82b.pdfIn PDF document text
    • http://files.bestdayeverevents.nl/uploads/1/3/1/4/131453539/bisizilitirekime.pdfIn PDF document text
    • http://files.ndjsource.com/uploads/1/3/1/6/131606844/9058623.pdfIn PDF document text
    • http://files.thecircleofdata.com/uploads/1/3/0/9/130969663/4807374.pdfIn PDF document text
    • https://site-1038737.mozfiles.com/files/1038737/73842697206.pdfIn PDF document text
    • https://site-1040391.mozfiles.com/files/1040391/mumatozapilovetegikekud.pdfIn PDF document text
    • https://site-1044416.mozfiles.com/files/1044416/86895620366.pdfIn PDF document text
    • https://site-1042271.mozfiles.com/files/1042271/56769356349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/eb57f9b2-ada4-4de4-8bba-e47b0239e0f1/81375349072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a918cd14-7fd3-4396-adb1-04b2f4f9845d/28152189887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ded3b1d-e718-4608-aa91-165518e984f5/27080330533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c431f08-0b96-4336-8170-15093829310e/29126856788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07babcd0-0039-4a6d-8e74-b70b1ad1c94f/loxuboked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95942ef6-06a2-4871-ae5e-816c248cf71d/78133073013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c075bed8-4cb7-4082-ac50-27c6abffc0e3/jonalofibimevub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2259b3d0-9a4d-414c-a3fa-edb649ee77a4/xakeralowof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B44 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00005c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2B 5804 bytes
SHA-256: 13d781cd9544391af3f5150e8c13d7a6819f440e29a4d8762747524bc3763475
font_02_sfnt_off00006fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 9900 bytes
SHA-256: dbfb657cc392450f91c6c8f3d44ee6d69b48c9e30330cbe56716c2a1ce42fc75
font_03_sfnt_off0000914b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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