Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27f47224c59edf9…

MALICIOUS

PDF

48.8 KB Created: 2020-10-09 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92f4e37d135a1bb7a4951004f0e830ea SHA-1: 61a14767a868a9a4d1e57d5902c24e8a3ec8bbd8 SHA-256: a27f47224c59edf982de1e53a1f30c3efcfc259f2a775d78d01bdc580676ebfc
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The document body, though partially corrupted, includes the target URL and appears to be a lure for search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of multiple links to disposable hosting further supports this assessment.

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 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://cctraff.ru/strik?keyword=skyrim+nirnroot+locations+blackreach In PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/jupesirozuloxevusuko.pdfIn PDF document text
    • https://site-1039852.mozfiles.com/files/1039852/27454025705.pdfIn PDF document text
    • https://site-1043698.mozfiles.com/files/1043698/78912041845.pdfIn PDF document text
    • https://site-1039665.mozfiles.com/files/1039665/taguf.pdfIn PDF document text
    • https://site-1044313.mozfiles.com/files/1044313/xixixamodatodadepexaluji.pdfIn PDF document text
    • http://fezog.norcalsquirrels.com/uploads/1/3/1/8/131856543/sujetejolena_tupiwid_bukodu.pdfIn PDF document text
    • http://files.edgewoodpc.org/uploads/1/3/0/9/130969283/840484.pdfIn PDF document text
    • http://files.praveenafernes.com/uploads/1/3/1/4/131482952/d692da9118d8.pdfIn PDF document text
    • http://xogefon.mosquitomaster.net/uploads/1/3/1/3/131380065/36310c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/472f0ea6-99dd-49bb-b27c-cb2495d69c2e/73028440615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fb0746-fac2-4c86-9959-6686b4a8539c/tasajiwixilif.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD8 5236 bytes
SHA-256: dc8a2c3f2ddf45c3a2be8244e04201af48c1dafe72a09bc55fa2a2b2315d2fd9
font_01_sfnt_off00006e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 10312 bytes
SHA-256: 0c30cd38078b1039bf10f156656981e0f8bc6e632f25e870d50dcdbd99ad2ce9
font_02_sfnt_off000091dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 16416 bytes
SHA-256: efd66f65d1b94f79c7af62192e18e81b767543013af9ed196379ca7adae87d2f
font_03_sfnt_off0000a7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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