Malicious PDF — malware analysis report

Static analysis result for SHA-256 39534524fbe10c41…

MALICIOUS

PDF

110.2 KB Created: 2021-01-10 06:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1a12c890daecd68eaba6d83a0c4572c4 SHA-1: 87d18809c1148ba661b1dd25d2a727b0594055ad SHA-256: 39534524fbe10c41476624e4d149589bd4842057d1c1227a502d1e3f17e37776
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including a critical finding for a malicious redirector link and ML classification. The document body, though heavily obfuscated, contains text that appears to be a lure for "brag sheet examples". The primary malicious indicator is the embedded URL pointing to `ggtraff.ru`, which is flagged as a malicious redirector. The presence of a password-protected archive lure suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ggtraff.ru/123?utm_term=navy+corpsman+brag+sheet+examples In PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/italian_fm_radio_stations_melbourne.pdfIn PDF document text
    • https://site-1196477.mozfiles.com/files/1196477/carmel_by_the_sea_restaurants_with_a_view.pdfIn PDF document text
    • https://site-1171776.mozfiles.com/files/1171776/wurufodi.pdfIn PDF document text
    • https://site-1083588.mozfiles.com/files/1083588/tamin.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/wizard_of_oz_munchkins.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/is_a_switch_leap_on_beam_a_c.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/6unrmx9/police_sound_mp3_download.pdfIn PDF document text
    • https://site-1176752.mozfiles.com/files/1176752/47454290674.pdfIn PDF document text
    • https://site-1178037.mozfiles.com/files/1178037/skyraider_ultralight_aircraft_kits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/jubekuzazumujete.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/beef_stew_nutrition_information.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_off00017159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17159 5684 bytes
SHA-256: 9ce8ecca579485a4b683d3a52dea2e38a00a3a4440b92aea7dabeeccf3ba1e93
font_01_sfnt_off0001849b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1849B 11544 bytes
SHA-256: 3987077307d04449de8cdd29170000fad6e2e6ddba041265b19306db88f9d63f

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