Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f487142c8184e03…

MALICIOUS

PDF

71.2 KB Created: 2020-12-14 21:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ff58dd6165fcc3e300181b12f56e86c3 SHA-1: 149184080bdf00e8ace037798334c2eb6d1bc06e SHA-256: 4f487142c8184e0305546200123a75296bb674794d0a586db1ec2fd849fb2a4d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafficel.ru/aws?utm_term=bollywood+music+video+free', suggests a lure related to free music videos. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=bollywood+music+video+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452861/normal_5fad778ca1412.pdfIn PDF document text
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/7299140.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/bazoba.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/8be73179-3959-4a70-96b8-02ba51a1f483/zaxusan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8499683b-9d85-4923-8495-c8adb7050aaf/zakimavepitukekabap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4610a27-6953-4959-b3b5-7172b44faf31/harry_winston_engagement_ring_gossip_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bbb444-9a2a-4417-8bc5-5a9231bacfbd/92096213076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ad6cdc-56ae-468f-b44e-de362830573b/mikodobuxatipebopeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6e7a61-fa19-4942-9582-9ded03fdc55c/pythagorean_theorem_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/ajay_atul_marathi_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/noxezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5dd884-e18b-4bab-b552-faf1f23187fe/printable_goat_gestation_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce22f8b-5bbe-4e80-9b39-a3ca278b4b59/2932855187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695abd22-8fb5-42d7-b2f1-aa1eaf603aab/47604014492.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 5260 bytes
SHA-256: b5a16218abd2ef721e554caf9fa1d2f96e8f5d0a9062da8cd8ac00ebc4115eb3
font_01_sfnt_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 11832 bytes
SHA-256: e0260363e29294f073819481695947f3d35c38cfa4ed368dfeede4d1ad682068

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