Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f271466a7ec521f…

MALICIOUS

PDF

50.7 KB Created: 2020-10-29 02:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0b1779cd1a6e53b8eea23085ea0ec30c SHA-1: 10341ce32b6a2edcaf57a5a157ec02d0a315d7e6 SHA-256: 8f271466a7ec521fa28818547a468704fbf7d97f0c55346b5b46ee3565a81cd9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malicious content. One of the primary URLs, 'https://ggtraff.ru/aws?keyword=empire+warriors+td+mod+apk+download', is flagged as a malicious redirector, indicating a high probability of leading users to harmful sites. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=empire+warriors+td+mod+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8e5c4f498d8.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/48dc8b195f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f88f9c323ede.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/4569626.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/jejuteziput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5f91f442b3b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5f8df26205143.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/nawiz.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/23e5607c5975d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5f92de77bf905.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/09ee7335-190f-41ef-87d3-290d53aea0b6/ramubemado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2a8d3c-0a00-4c45-ad07-65f89af24715/41033238208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c0f86-550e-4a5a-9d47-067c813948c0/96251800966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcc7130-5bd2-4997-8fae-e7192268d0d6/16462098139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160ee5c5-909b-4237-a99a-9d502742f785/62500739819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd5eb1b-05c3-481e-b0f6-97da10fa97e7/27341391623.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/37245296947.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/ninujejalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6538b4-eff4-4018-abb4-9575e978cecd/vibez.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E74 5216 bytes
SHA-256: 6f5137d87fe10517d072cb1995fb537fff98a02bdcb839d16a06fba9521ba8ee
font_01_sfnt_off0000802c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 11652 bytes
SHA-256: 5a121a04a543d24535582049a63a308f002c4ef998d9ac28d05ecfcbc76c85dd
font_02_sfnt_off0000a74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA74A 16296 bytes
SHA-256: 4edaf25601b4e2b136a55a18bb8038895a84b80154dbfc63be4c6481ae6237c8