Malicious PDF — malware analysis report

Static analysis result for SHA-256 af61d4e1cec137f5…

MALICIOUS

PDF

33.9 KB Created: 2020-10-04 18:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 163988c17beb276b5a229cada95dac72 SHA-1: 3afbeda7e7796568b5e96d535a40545e8b72a857 SHA-256: af61d4e1cec137f5a138a07a3f5e7f47163c718bcedb316ca7b554aa8b0e2f5c
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=bengali+movie+chokher+bali+full+video', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of multiple links on disposable hosting further supports a malicious intent, likely to redirect users to a phishing or malware site.

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://gettraff.ru/strik?keyword=bengali+movie+chokher+bali+full+video In PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/18302351869.pdfIn PDF document text
    • http://files.followmetofifty.com/uploads/1/3/0/9/130969489/7586229.pdfIn PDF document text
    • http://files.stamfordbenefice.com/uploads/1/3/1/4/131406563/fefexevuvezupa_vobovomurape_bomuvujob_razesakade.pdfIn PDF document text
    • http://files.divineenergychurch.com/uploads/1/3/1/4/131408432/riviwe.pdfIn PDF document text
    • http://files.runford103.org/uploads/1/3/1/4/131483662/medoludesa.pdfIn PDF document text
    • http://files.delphicoracle.org/uploads/1/3/0/8/130814831/febb3a.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/50f21a96-3f3b-453f-9f28-16981cf5f5ea/livamam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1def4a41-6b53-4ada-bebe-3ebeb137d3b0/tasokutafasixexafop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8fc31b-9c35-42a6-897c-40605d4d62ed/jenuvamitenadowuxifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0461d442-130e-4499-a020-4feb5ff1a5ef/11160941530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5338/3581/files/90188678845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4548/2407/files/permatex_anti_seize_nickel.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_off0000444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x444F 5572 bytes
SHA-256: 1b08a47713f9119ef3f10e3db0732c1496d0437ba6d829be0898ff8fab5e4bf2
font_01_sfnt_off00005720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5720 10512 bytes
SHA-256: 22c07f63bb73d5418b3671b0d1eb84c8561752da41b19b57c9e11040a4725bbc

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