Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e82cbcd139317cc…

MALICIOUS

PDF

34.8 KB Created: 2020-10-29 11:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8a2890a9e80ad6e2ce4ca5d71a9bee4 SHA-1: d842290cb7ce366f242a690544237a36fbd3e9a4 SHA-256: 6e82cbcd139317cc865ba5f953a21d20649500011bb62069c21190d5da745266
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its inclusion of numerous links to external websites, many of which are suspected to be part of a link farm or redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for downloading a PDF, and one of the embedded links, 'https://ttraff.link/123?keyword=a+brief+history+of+the+romans+pdf+download', is flagged as a known malicious redirector. The presence of multiple Weebly-hosted PDF links further supports the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/123?keyword=a+brief+history+of+the+romans+pdf+download In PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/xofenibijuli-zaxupupam-wababubimaki.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/venunigimok.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/bovuwebav.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/tupirinaxezu_jekobul.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/tamigukolus.pdfIn PDF document text
    • https://zirasave.weebly.com/uploads/1/3/4/0/134096010/c63a524c2.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/tasafomiw.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/golepe/menefitiwiwupawuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93459f96-8ff9-48f6-874a-51e8ca2bc7ec/pur_rf-9999_replacement_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/sutaxitadudejuxepisadubod.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/josedano.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/indian_air_force_previous_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/azoospermie_scrtoire.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_off000048b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B7 5604 bytes
SHA-256: 0a418715f71c9142e88c03416711c9768f8320a0682367d341ee0f0d3268af14
font_01_sfnt_off00005ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA9 9936 bytes
SHA-256: fe1b9524366d5be7155eba2d2a4a9ac3471d57b6fa8443666116fb45fe7c88a1

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