Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fff6864f200bd84…

MALICIOUS

PDF

63.8 KB Created: 2021-03-03 23:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42a7319d590075ead416a5f78a6eac50 SHA-1: 264b3dae3f958ad0a538676478d90c74bfb38f6c SHA-256: 6fff6864f200bd84efb610118b1878c103b1f6175cc265c12d6cd4fab3cb2ba0
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, characteristic of a link farm. One of these links directs to known malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=ucsd+map+of+science In PDF document text
    • https://cdn.sqhk.co/zasemewiti/TbjjZR4/riptide_gp2_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/hgibhe9/bts_piano_army_tiles_kpop_magic.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/q6Tgcgg/hitman_golden_handshake_vodka.pdfIn PDF document text
    • http://gunepevoxop.66ghz.com/84592773826.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/nuredumaxusenuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/Vhd8qhb/super_beyblade_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/iiaqShd/42045536155.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/vumojidipilov-rofetak-rijise-wetoguvoriri.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/jbyjeij/national_cinema_abu_dhabi_uae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/sikiradupoxisobodojobowu.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/crossfit_athlete_training_schedule.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/gamudopan.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/english_to_spanish_translation_sentences_free.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_off0000bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 5164 bytes
SHA-256: 02140575669d6275fb7471d121fc7903670d8678574f4904c9960338ed631b6f
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 10064 bytes
SHA-256: aa012f194b6c69e03a4408c490e89af51683f43572380f5ac3e382d0849a687c

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