Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d73f7dd25217693…

MALICIOUS

PDF

34.2 KB Created: 2020-10-31 16:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5261312202565e0a1daa9319e77ba630 SHA-1: 551720d2bd5c0d44efacb873110ba406fc4ba3b0 SHA-256: 6d73f7dd25217693d7f39dbe6b210a41dc2e18405a3b22ce663d2f2c0b31eb91
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL designed to redirect users to potentially malicious content, disguised as a search result. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm tactic. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.me/123?keyword=search+fresno+county+jail+inmate+release+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8820f2b311a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c0efd0-cf42-46f8-8ade-8111c7f0e089/73317037922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa76484-7ec9-4a9c-a056-7f577d5724cb/dewanijifuvofojeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3120/2472/files/shelf_life_of_beer_in_a_growler.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4400/2714/files/bisolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9959aa67-69a2-41fc-a063-afaeb836f84d/nawek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/7365/5710/files/skam_france_season_1_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/fillmore_charlotte_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/15143910679.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/34283172938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6666c107-29eb-40df-a30a-86468b165755/zisabibodilofewipezoxiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db50bcd-fd14-47c6-b870-0171a0fe1649/vijimijojovanopavomid.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4815 5540 bytes
SHA-256: 5460a69cd06c46f695e63b2a0de31dcdc8f9d5cd146f474e8d13b5a0c5b3879f
font_01_sfnt_off00005ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD0 9688 bytes
SHA-256: 0264439a9cea517d3823d0d42f3f70645f0198d0fb6a255098cbc217bf3ff0d8

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