Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0a42f43f3e7672…

MALICIOUS

PDF

40.2 KB Created: 2020-10-07 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 872d800d529930c062fb628ca6e78843 SHA-1: 9495fc2d4e20e7e9db442d92c02a1846c4630f9c SHA-256: 6e0a42f43f3e7672b302fcb6c82f50bef5220b3a20d6219c6312af88b7e934bc
174 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=professional+ethics+pdf+icai'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on strikinglycdn.com, suggesting a lure to external malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=professional+ethics+pdf+icai In PDF document text
    • http://wezoberoz.pureexistencedance.com/uploads/1/3/0/7/130739892/4077893.pdfIn PDF document text
    • http://mutitosi.sisterssangha.org/uploads/1/3/0/9/130969521/rurodaduro.pdfIn PDF document text
    • http://files.advancematerialrecovery.com/uploads/1/3/1/4/131454297/995fd54b60.pdfIn PDF document text
    • http://gabibaduj.petoskeynorthmenmath.com/uploads/1/3/0/8/130813528/bagedije.pdfIn PDF document text
    • http://files.esjohnson.com/uploads/1/3/1/3/131380342/cf2558f25a93.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/07a4b029-51dd-4884-b19c-5a1b4460a032/tazenezegobuvufadadulad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0475b28c-b7ad-42bd-a2f6-c62aba625df4/31150645060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2848a7c4-4716-486e-b581-bb76d178f098/fefowid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedd0a60-da35-4d7f-97a5-ecb3e661326b/nemuwirufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/600353df-7dfa-48dd-b397-51a19d7b6d3f/pogoxipodufenorilujegasun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b7a55f-e5f9-43b0-a7a8-d1acddb670b1/rowukowejedeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029891ba-f6fb-4c29-b5ed-55682d59c0e8/bomone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eddc12-bf11-42e5-b13f-78a1a4ade945/tatukevutusaxajazovuweja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/6951772363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2516/9565/files/trophyline_tree_saddle_mission_platform.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_off00005f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F84 5244 bytes
SHA-256: 75ce0280b5b961b2ee3dffdb6870bbb45662b44e7914094ae4a5dabb75642f80
font_01_sfnt_off00007153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 10128 bytes
SHA-256: cefee30f06f99cb6dbb924334099a661d52d74d3980b621f13ce840b8b7a9674

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