Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a222eb39d5ea44…

MALICIOUS

PDF

127.7 KB Created: 2020-10-27 15:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fcf40d5b7cfbdebfceedcd9c851d6b48 SHA-1: 4823f49c8d0e584221674dbca355c8f3d7d4a0ba SHA-256: 20a222eb39d5ea445064c395b8d31adc045a838cef2d90733ddacca70679edfe
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic through search engine optimization. The primary malicious URL identified is https://ggtraff.ru/strik?keyword=battlefield+1942+sniper+guide, which is flagged as a malicious redirector.

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/strik?keyword=battlefield+1942+sniper+guide In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/5711585.pdfIn PDF document text
    • https://ramowukegi.weebly.com/uploads/1/3/4/5/134508735/6934606.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/pumuja.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/19db77811.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/772bcc2fa0.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://s3.amazonaws.com/petikamov/gunaziwowar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daee2d60-8e89-4040-93ba-be2050162234/gejuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17579c9-ce6a-4892-b878-327d14541ef1/vuxukelosivuruso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04313492-2c29-4258-a05f-7907bacef449/dukorebajisixapej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1099f0a7-157b-4f34-9526-998605cefd20/39949044406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/biochemistry_jeremy_berg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/bafotesevawilosul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/jurnal_strongyloides_stercoralis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6383/1459/files/35610266560.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0931/0359/files/koran_kompas_gratis.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_off0001a8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8E8 5460 bytes
SHA-256: 83ea581f906363c0c3abfeae3f3e0a6d35c7320c79400bf2622422bb0969ea20
font_01_sfnt_off0001bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB80 11560 bytes
SHA-256: 8a4c71758b2834b3258868fba515874bb97002cf8f0c41ded2e1346ef72a4945
font_02_sfnt_off0001e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2E2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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