Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa12252871302923…

MALICIOUS

PDF

42.7 KB Created: 2020-10-09 07:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e251193b47899482c08df91b4ff538e1 SHA-1: 1b44a9a290004639e6d47d4f991398b6849ad8fa SHA-256: aa12252871302923bf21604c55121fcaf9f96318d56f3c8494bf93cdc2eb35f0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or redirector strategy. The primary URL identified, https://cctraff.ru/strik, is flagged as malicious. The document body, though heavily obfuscated, contains references to game guides and URLs, reinforcing the lure tactic. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=fallout+4+survival+mode+leveling+guide In PDF document text
    • http://files.cornelialotito.com/uploads/1/3/1/6/131636983/bogidoz.pdfIn PDF document text
    • http://javurufi.vox.vet/uploads/1/3/0/7/130775853/382cd243.pdfIn PDF document text
    • http://files.adaisyadayvintageandantiques.com/uploads/1/3/2/8/132815359/9c27810cf5.pdfIn PDF document text
    • http://files.hboplayers.com/uploads/1/3/0/9/130969845/f9eb6.pdfIn PDF document text
    • http://gipos.gcpageants.com/uploads/1/3/0/9/130969862/zonazojipiz.pdfIn PDF document text
    • http://files.sophiawalldesigns.com/uploads/1/3/2/6/132680789/buduvedax_vipixagi_dogetoruzikas.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/besenuvumuzepemez.pdfIn PDF document text
    • https://site-1038830.mozfiles.com/files/1038830/49885978885.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/189f5957-0594-4848-b00a-f2c559d64000/dexivot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3d3b72-e475-4c94-b25b-f42063a40822/gugeximi.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_off00006972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6972 5248 bytes
SHA-256: 2d8e7236ce0b20648366fe2f2e8052bc91b1f89ac1240bb87a394ddcedf9e54a
font_01_sfnt_off00007b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 10236 bytes
SHA-256: f6a88b2317315429dac6b132026997af13ce73f7617b407d9a37b82938fbdca4

Open this report in the interactive analyzer, or submit your own file for analysis.