Malicious PDF — malware analysis report

Static analysis result for SHA-256 527a3a96ad886b3c…

MALICIOUS

PDF

117.6 KB Created: 2020-11-02 05:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 80057a44905d8f5aefd1b6086fc063d4 SHA-1: 12e8ebe692f76039b5def5bde2a90113759b5f85 SHA-256: 527a3a96ad886b3c486fecd163b82e900765c0085f6a8cd2c33237277b80d75a
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to "jean keating prison bonds pdf". The presence of multiple external PDF links and a malicious redirector indicates an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ttraff.club/123?keyword=jean+keating+prison+bonds+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_5f968a3366177.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/1/0440/8262/6710/files/motels_las_vegas_near_airport.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/6263/7742/files/hardware_acceleration_android_turn_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a6c730-c8d8-4bc7-9f4f-c9d511f53cf6/97760818442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab998f96-c0ce-418e-a4fb-a3257fe25676/zetuvezeroboxiwuwiraraxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81d828e-53b4-4b0c-a22e-8e1bc3e4f84b/39451448006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86940a4d-7894-482d-9448-afebd107f9b9/ximovagepiburufejikopejo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/jumia_app_download_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a84bdf-8e0d-4ced-a251-cc94f106f76d/jomaxelozobuvivukitiberi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea8fc46-41ba-443a-8820-515302cf9dc3/sign_into_hotmail.com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/600523ea-6d73-4e4b-ad55-73b6adddda86/kovazuke.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_off00018fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA8 5368 bytes
SHA-256: 0fe73b34a6d55e616360d0b1dd2c8b7c3820078b146949b83a83a2e0eada8a71
font_01_sfnt_off0001a1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1FB 11796 bytes
SHA-256: e9622054ef90625b4893db0e7e67dcdada567e3532bd4f8d9afb979ac32a27e0

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