Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a919fea538cd6a0…

MALICIOUS

PDF

50.3 KB Created: 2020-11-08 02:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c6f18301dd9383a16a97e2aa3996211b SHA-1: d78be8fec577984b9bf4a6f2b1acf2ee7a8a6bca SHA-256: 2a919fea538cd6a01ad1dab88f905256bfb491fceb997132cefa6cfb18699396
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of an SEO link farm. One of these links, https://ggtraff.ru/123?keyword=sniper+farming+guide+ragnarok+mobile, is known to lead to malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a coordinated effort to distribute malicious content or traffic. No scripts were extracted, but the primary attack vector appears to be social engineering via link redirection.

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://ggtraff.ru/123?keyword=sniper+farming+guide+ragnarok+mobile In PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/8d8aefbd93.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/fakarizidokopov.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/2720091.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/metudejinaril_fiwipuju_xararozeku.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/2a2e4b6ae9e4ad6.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/3943123.pdfIn PDF document text
    • https://wewiwefiwowofaj.weebly.com/uploads/1/3/4/3/134369931/ginadabowupen.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/5fab61a198eecf.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://duwozonitumo.files.wordpress.com/2020/11/angulos_agudos_obtusos_y_rectos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3760593a-4a75-4e81-ab78-877cdb4011ce/93303301681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3dca7ee-95aa-49e4-a3fc-64cd5dfbb53f/83802871876.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF0 5292 bytes
SHA-256: f44e1d27e6864028732f5e591c031fbc1dad1d7b7becd6e9634771dd2f63eb67
font_01_sfnt_off00007dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 15100 bytes
SHA-256: c4cdd2743c956c32bc00b90d9afa824fadfe118098ec86495738361c17b1a464
font_02_sfnt_off0000ade7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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