Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b6dfa40c899b1…

MALICIOUS

PDF

38.4 KB Created: 2020-11-04 16:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9875d158f52f2b4b3052d555daab7a22 SHA-1: d6604e4fa1a4f903c5c5b8ffea3f02f416c0ba15 SHA-256: 628b6dfa40c899b145b118c9d4fb8e44b5b04d2f92fc3ab29a3b5d63f6b20578
184 Risk Score

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 known malicious redirectors. The document body text, though partially obfuscated, includes a URL that appears to be part of a lure related to video game guides. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for SEO poisoning and driving traffic to malicious sites.

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/123?keyword=pokemon+sword+and+shield+guide+book+gamestop In PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/suriforinisirovezi.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/f45e21e.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7ef482e735654.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/5345642.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/vigajig.pdfIn PDF document text
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/sugod_nuvulutuvob.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/febexo.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/2416698.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/3225387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f9e348856864.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/sinimojapezenewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3543/3882/files/epub_to_converter_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e139eef5-71a4-4c6c-a921-eaa09fffc59c/gukopebojiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581f2b03-8839-469b-b42d-730d1fa63e71/gowujipaji.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_off00005421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5421 5672 bytes
SHA-256: 6a32321d7d0d91ae2c369aa8c7b818fa405851ca9fd28d353692973e9be21109
font_01_sfnt_off0000675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 10684 bytes
SHA-256: 72549e1983dba2760526a919164a8cece6680c4043fccbf0ebb0b71efd0684f0

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