Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b4501c42c2f208…

MALICIOUS

PDF

44.7 KB Created: 2020-10-06 20:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 27c7a06f8d8a66601b5140138c8c2446 SHA-1: f194f1b3057066dfe7c92d363d774a76fa9c1426 SHA-256: 97b4501c42c2f208d9fbe7862b42b4c4c0e2ab8a34c9d70dd043f6c3504442d3
224 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at https://cctraff.ru/strik?keyword=placement+assessment+pdf. The document body text, though heavily obfuscated, contains keywords related to 'placement assessment pdf' and embedded URLs, suggesting a phishing or malware delivery attempt. The presence of multiple external PDF links, some on disposable hosting, indicates a link farm strategy to potentially distribute malware or lead users to malicious content.

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://cctraff.ru/strik?keyword=placement+assessment+pdf In PDF document text
    • http://files.sebastopolredwoodhouse.com/uploads/1/3/1/3/131398260/kusigop_legelemo_figaluz_tukobaroxi.pdfIn PDF document text
    • http://files.gospel.link/uploads/1/3/1/6/131606006/3151977.pdfIn PDF document text
    • http://files.akamitzi.com/uploads/1/3/1/1/131164355/a4af0a23.pdfIn PDF document text
    • http://files.didsburydentalpracticemanchester.co.uk/uploads/1/3/0/7/130740022/selexit_vufokepuriti.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/80165687099.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/51488541748.pdfIn PDF document text
    • http://files.apostolictemplela.org/uploads/1/3/1/8/131856277/dazexovukepezuja.pdfIn PDF document text
    • http://files.almostheavenoutdoors.com/uploads/1/3/1/3/131381363/80692f6cc99.pdfIn PDF document text
    • http://files.plan-to-wander.com/uploads/1/3/2/6/132695575/2744033d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/bettendorf_high_school_graduation_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6295/1581/files/16583398983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/who_made_the_potatoe_salad_tubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2086/1092/files/black_keys_tighten_up_tab.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_off00007136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 5208 bytes
SHA-256: a62bdce6f167bf5a591faeb67a082e7eb9a754903aa255a758610c9f7187324f
font_01_sfnt_off000082e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E3 10284 bytes
SHA-256: 586aba1a04429c2fbec2599bc3befb63d36da8150ca7100efb85e990c957b53b

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