Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1263f1172783a7…

MALICIOUS

PDF

72.3 KB Created: 2021-03-04 04:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d3e2cf53dacc007655e52ddb5de2f75 SHA-1: 843b9d612aaa6fadc7ca5f760e18ed0871ddfe8d SHA-256: aa1263f1172783a700a825a9d2d68926712e20d037ac0a6eb30e69f61e05dbe4
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to common search queries, suggesting a phishing or scam lure. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://dafemum.ru/strik?utm_term=how+much+would+it+cost+to+replace+floor+joists In PDF document text
    • http://help-copyrighteamservice.com/excel_vba_check_if_value_exists_in_column_rangebun6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601a7419eea3d.pdfIn PDF document text
    • http://itdiscounts.info/avengers_endgame_full_movie_linklh4yp.pdfIn PDF document text
    • http://job-finder.space/how_to_calculate_sat_score_percentage_in_egyptyxqpe.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/how_did_absolutism_affect_europexaz8a.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/gcOifvu/39103919549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_602b68adecc05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_601e02fb25d1e.pdfIn PDF document text
    • http://it50off.info/online_coupons_for_harbor_freight_toolscxc00.pdfIn PDF document text
    • http://vetokikiw.22web.org/what_does_literacy_week_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovetijif/21582684929.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/88521191109.pdfIn PDF document text
    • http://teruwisap.epizy.com/40704188928.pdfIn PDF document text
    • http://kanabikovokes.epizy.com/lightning_returns_quest_guide.pdfIn PDF document text
    • http://natomilalusirof.rf.gd/33374365468.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 5524 bytes
SHA-256: ba338b371e3767f4985156913fcd2e9f196c9481ceabbe401eedd45775987057
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10628 bytes
SHA-256: b76e369e998054ca4fba060e918f4860d7fe84d5807c834d7449594d73a60cf2

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