Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f69f0be663392b…

MALICIOUS

PDF

51.1 KB Created: 2020-10-02 06:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5629c602edf9b3174b7ac0c553dce496 SHA-1: 84b7125e1b1dc1cf5005b3707f736555e5641620 SHA-256: d7f69f0be663392b2136a8981e52f9d9fff9cf183ef9e4d20bdc4d105931f975
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=difference+between+cash+accounting+and+accrual+accounting.

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://ggtraff.ru/strik?keyword=difference+between+cash+accounting+and+accrual+accounting In PDF document text
    • http://xawetawi.creeksideinthecanyon.com/uploads/1/3/2/8/132814930/4400748.pdfIn PDF document text
    • http://katoda.mustangownersmuseum.com/uploads/1/3/1/6/131607984/6174899.pdfIn PDF document text
    • http://nofelol.alex-chien.com/uploads/1/3/0/8/130814328/xanafugusutoti.pdfIn PDF document text
    • https://site-1036667.mozfiles.com/files/1036667/41796484871.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/guwexuwewavoruvabixinobup.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/86071365705.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/morubibizusinif.pdfIn PDF document text
    • https://site-1038777.mozfiles.com/files/1038777/71992285762.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/semaguvogekuwuwifolalufer.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/motesezitarap.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/24045996215.pdfIn PDF document text
    • http://files.brockportmall.com/uploads/1/3/1/4/131407802/ludogebij-dufiwameropem-fivewig.pdfIn PDF document text
    • http://rezelipib.defineyourbliss.com/uploads/1/3/1/1/131163992/pozikelaribe.pdfIn PDF document text
    • http://tuvasi.harriscreekpta.com/uploads/1/3/1/4/131412290/5423395.pdfIn PDF document text
    • http://wizukix.tagdogtraining.com/uploads/1/3/1/0/131070289/5896797.pdfIn PDF document text
    • http://files.shineeventdesign.com/uploads/1/3/2/7/132712514/vepatusunoto_pexaru_fefajosujemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000885b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x885B 5512 bytes
SHA-256: bab65e42d4de952d2ba61af2e4bb70e274e4c9cdad8a8a11344b51c4ba68c4e4
font_01_sfnt_off00009b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2A 10420 bytes
SHA-256: 6993d6bc844efb57dd6936c7b83015f617fc1f3ea82dc44cf52edfd03c408a99

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