Malicious PDF — malware analysis report

Static analysis result for SHA-256 120e9777fcf46c7c…

MALICIOUS

PDF

40.8 KB Created: 2020-11-08 20:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e716f3691227d6bba833b4932b34221f SHA-1: 15e93dfff187731c142584110b5aaaf781562642 SHA-256: 120e9777fcf46c7cdd3847cdb93886e6eeeb07ee9f28506452eb122446a4d86b
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and link farms. One prominent URL, 'https://traffnew.ru/123?keyword=nissan+frontier+manual+transmission', is embedded within the document body, suggesting a lure to a specific search result. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm on disposable hosting further supports a malicious intent, likely to drive traffic or potentially distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://traffnew.ru/123?keyword=nissan+frontier+manual+transmission PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f9ebbdabd9cc.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/mizotebufufekokowok.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/637dda92-9354-4704-b8ff-a3696478ece5/nixafobuverirunanubiroza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86dada7-b8ce-40fb-9021-415d9d2d2551/jojorodol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7077663-5f3b-4318-b8e1-7a4a5acd5914/dugalewu.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fatavizabid.pdfIn PDF document text
    • https://gonugatak.files.wordpress.com/2020/11/48605777943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ce049f-1388-46c7-9529-20294cd4ed24/45327349723.pdfIn PDF document text
    • https://safopidupi.files.wordpress.com/2020/11/estimating_in_building_construction_download.pdfIn PDF document text
    • https://wadenol.files.wordpress.com/2020/11/45268552415.pdfIn PDF document text
    • https://sizixef.files.wordpress.com/2020/11/90261814298.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/85748538280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8219c6bc-93fa-4475-bc76-09452b4100d2/best_manual_camera_android.pdfIn PDF document text
    • https://davitiruwax.files.wordpress.com/2020/11/12909665365.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.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_off000062b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B7 4884 bytes
SHA-256: f71a1f33d18d7e8abe6d879776d7efdb534d14dd582c4a421e048b5dd801dc55
font_01_sfnt_off0000733e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 10136 bytes
SHA-256: 38d27ce6e854a18d29d1443b7a9ed73f88d322c937a1c1d86baf4d63d5e01b2a

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