Malicious PDF — malware analysis report

Static analysis result for SHA-256 f930f1cbb534433e…

MALICIOUS

PDF

40.3 KB Created: 2020-11-03 13:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ccc6d95d2067956d67946a3fe3057e92 SHA-1: b9a1f8ee18e01aca981f6e56e09bec1143a1d803 SHA-256: f930f1cbb534433e20723de155bb57615b256f99ce452414ebc79d4ce4cbce1c
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text, though heavily obfuscated, appears to contain the URL 'https://cctraff.ru/aws?keyword=osage+river+range+bag', suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=osage+river+range+bag In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f97b2dab10fe.pdfIn PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/99d87bd15.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/lemexo.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/boziladed.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/15e8d3c62b9a40e.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/gagizimebuvodofefije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/overdressed_elizabeth_cline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051d9063-815d-43ed-be01-d300b5f4db3c/12988490246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1a04cf-4945-4434-8218-4a4c5a4e974e/world_history_guided_reading_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0126b0a7-1085-4925-b0fe-6a8af9fc1786/lekoxevelefijuwemubuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac65fe8a-2d89-4e07-82d2-4a493a625c1b/60727492453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5799fb36-7c1d-4214-ae79-40ffc4e6ade9/sosuroguwes.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_off000060ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 5048 bytes
SHA-256: 11aeb25716f379058b4c527c6c418a079db63377ca5824462ecfcc23204b9354
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10108 bytes
SHA-256: 0fa33cb519bf359b4db1458455356eeab1ce384bb8d3df02bd0eef893607a960

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