Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c9e7fcc1d78b69…

MALICIOUS

PDF

76.5 KB Created: 2020-11-22 22:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b2b95d559b0d02b7adc994d4a108ba1 SHA-1: 762145b7ea77d339fd67e5365ddd50b8bdd27de3 SHA-256: 18c9e7fcc1d78b69d929f2d293b9a48173787fcee917d47de0d8bc9f2380c82d
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Kent county register of deeds online', suggesting a lure for a phishing or advance-fee scam. The presence of a malicious redirector URL strongly indicates an attempt to lead the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://gettraff.ru/123?utm_term=kent+county+register+of+deeds+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kizugokofo/hoover_spinscrub_60_carpet_cleaner_instructions.pdf
    • https://s3.amazonaws.com/towakog/84908091361.pdf
    • https://s3.amazonaws.com/xidulumexi/23899037509.pdf
    • https://s3.amazonaws.com/rekawexuretowo/5972367261.pdf
    • https://uploads.strikinglycdn.com/files/0cc23662-4014-44c2-975e-6be8265fa54e/queen_malayalam_full_movie_download_hd.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/ma_armstrong_basic_topology.pdf
    • https://s3.amazonaws.com/rorives/discovery_animal_planet_video.pdf
    • https://s3.amazonaws.com/leteraxewe/58499921086.pdf
    • https://uploads.strikinglycdn.com/files/a48bc9e0-1587-4bc7-8060-5a19efdede4c/vexasuvevotefavimigat.pdf
    • https://uploads.strikinglycdn.com/files/41378961-5505-4fc0-8880-38736c985b7b/24419118822.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7f.bin
63ee19416a6dfe6a6ada82742376f476b247c0218ecd12e6ffd64bf0367ea3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 4932 bytes
font_01_sfnt_off0000f061.bin
e8ea457215a1f38be31cc9053f62075b90f64afcfb8079a0c65fc311a0a8a13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 11048 bytes
font_02_sfnt_off00011588.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 4324 bytes

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