Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa3b7370855585c…

MALICIOUS

PDF

47.2 KB Created: 2020-10-04 05:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab22034a218f702b6c96bb07eaf982b5 SHA-1: f1890f93bebe6086c62cf06b25bc0ccd715595d1 SHA-256: 6fa3b7370855585ccda2858e76b1f961169d10764add886e445a78b73783f26f
224 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential for further malicious redirection. The document body itself contains garbled text but includes the URL 'https://ggtraff.ru/strik?keyword=mujercitas+1949+descargar+pelicula+c', which is also flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ggtraff.ru/strik?keyword=mujercitas+1949+descargar+pelicula+c In PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/tunogareg.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/44265288373.pdfIn PDF document text
    • https://site-1041188.mozfiles.com/files/1041188/sebexanifenugo.pdfIn PDF document text
    • https://site-1038653.mozfiles.com/files/1038653/58074690951.pdfIn PDF document text
    • http://files.thesacredfemme.com/uploads/1/3/0/7/130776212/9274661.pdfIn PDF document text
    • http://files.helporginc.org/uploads/1/3/0/7/130775365/dozapilogobo-kolezenodujuna.pdfIn PDF document text
    • http://files.bestestiedayspa.com/uploads/1/3/2/6/132696113/jiwobepusejufojasoka.pdfIn PDF document text
    • http://files.glenholtcommunitymarket.co.uk/uploads/1/3/1/4/131406736/mixusufuzoperuz.pdfIn PDF document text
    • http://rixujegu.matthewsflowerboutiquebloominbouquet.com/uploads/1/3/1/8/131856339/kovapes.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/46f10e09-36c9-4eda-b1f3-63d7324416da/tazologetegenade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfdb662-985c-4581-a48b-06efada8dcd7/minil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac1feb9-8413-4438-8bb6-3c384bead858/44329964095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd2f1db-b88f-4e80-9665-9f7c332b88c0/zobesilirofusam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad5c68c-c289-4703-8dba-d381279d5c32/18912310956.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_off0000758e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758E 5620 bytes
SHA-256: 03bece22116aa859127e5158ebcae0bd610f832106aa1d417f9e88c74f36d33d
font_01_sfnt_off000088cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88CC 11596 bytes
SHA-256: 0f30f42a2ed4352033aaf2639bcae05911435bd728a787ebdd74a6351704f2ab

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