Malicious PDF — malware analysis report

Static analysis result for SHA-256 b945ac2cb50f9a94…

MALICIOUS

PDF

47.4 KB Created: 2020-10-04 05:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1637c9ac67ad1860684911a7f87247f2 SHA-1: 9c2152edc0d171e6c4ea74c1ae7481e17e22eb49 SHA-256: b945ac2cb50f9a9458de4430745e55eb721d7ae5fd1c825e3d7496c8b7209fd3
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs pointing to disposable domains, with one identified as a malicious redirector. Heuristics indicate the document is designed as a lure, potentially for credential harvesting (MFA lure) or to trick users into downloading further payloads, as suggested by the password-protected archive lure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=yuvashree+9th+list+pdf In PDF document text
    • http://files.3dswebpage.com/uploads/1/3/2/7/132712185/35b66a5c96e6.pdfIn PDF document text
    • http://jepofovuk.southhastingsbaseballleague.com/uploads/1/3/1/4/131454065/c95ef234c.pdfIn PDF document text
    • http://virewiwew.secondstoryhoney.com/uploads/1/3/1/0/131070894/bb3aa89b1b1acd.pdfIn PDF document text
    • http://files.lakeisabellabassclub.com/uploads/1/3/1/8/131856191/gibepuxoxuni_xasosewovixewib_fotijupen.pdfIn PDF document text
    • http://files.wendyteakel.com/uploads/1/3/0/8/130814132/836ff7bb0.pdfIn PDF document text
    • https://site-1040080.mozfiles.com/files/1040080/luzuve.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/48182319341.pdfIn PDF document text
    • https://site-1038520.mozfiles.com/files/1038520/lesepejizazugus.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/42710970066.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/1/0430/4420/8789/files/jugabun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/zuvov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9542/5949/files/lab_8_integumentary_system_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/how_to_put_batteries_in_bike_lights.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_off0000798e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 5308 bytes
SHA-256: 6122614808bda1c71c804ef3e2cb08afd2807b442279581be8811dbd7f7a2c3f
font_01_sfnt_off00008b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B98 11100 bytes
SHA-256: 83e63094f66f46e2f1e980399cc9333f8181d4aaa065ef63e5f58923f8077dc2

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