Malicious PDF — malware analysis report

Static analysis result for SHA-256 547eefb6bde9160d…

MALICIOUS

PDF

33.8 KB Created: 2020-10-09 00:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7554140109a77c09478455fa32e4768 SHA-1: fcd6f0f224f00b7212ce438593b04b6fa9c78e3d SHA-256: 547eefb6bde9160d8048be716ab37c25205a6608d15a0efa42cbcfa153d585cd
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent behind this link farm. While no scripts were extracted, the structure and heuristics point towards a campaign distributing malicious content or engaging in SEO manipulation.

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://cctraff.ru/pify?keyword=the+lorax+economics+worksheet+answers In PDF document text
    • http://gamajevat.memige.com/uploads/1/3/1/3/131380828/8504606.pdfIn PDF document text
    • http://files.gamomentumathletics.com/uploads/1/3/0/7/130738806/2f41847.pdfIn PDF document text
    • http://files.myartesanostore.com/uploads/1/3/0/7/130740461/lupugipo.pdfIn PDF document text
    • http://files.yuanmodellinggroup.com/uploads/1/3/0/7/130776330/fowetolopawe_vuwebixajoxox_zaroroborafa_pewafego.pdfIn PDF document text
    • http://rasebo.americanpostandbeam.com/uploads/1/3/2/6/132681144/1dec50419bbe.pdfIn PDF document text
    • http://files.oiaracing.com/uploads/1/3/1/4/131438843/9449356.pdfIn PDF document text
    • http://files.al-shields.com/uploads/1/3/1/4/131406950/bujogelo-gidomelesoko-xuxumije-duvejem.pdfIn PDF document text
    • https://site-1040602.mozfiles.com/files/1040602/zadozuza.pdfIn PDF document text
    • https://site-1040602.mozfiles.com/files/1040602/42777551275.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/83dd1847-b7d8-4053-bb4b-b9f1aab6fca5/delajesafate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc95f84d-1a49-4167-a31e-4411faae1f91/juraga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2784c82-29e5-4fd5-aa47-0d759d243841/80189765227.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_off00004ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD7 5212 bytes
SHA-256: 4215d0fc35d3d51ae86de495ca4b6a291238578e1c5d38d663ab26a739c5cef7
font_01_sfnt_off00005c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 8864 bytes
SHA-256: 0d7743a907738719a9c33da808b482d4b5aedd8b9c16df2d765710338f4ebc21

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