Malicious PDF — malware analysis report

Static analysis result for SHA-256 7166ffeccea6ee55…

MALICIOUS

PDF

48.3 KB Created: 2020-10-17 23:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e2a8e9f5f50e1843a3012d2affdac67 SHA-1: f4e18f53787e201b7b0f2f086ba0a0b0c4a76294 SHA-256: 7166ffeccea6ee558b5fc033cf931c15c379ac95bdf802cc6bec4a422e02295b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO spamming attempt. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/wb?keyword=pokemon%20glazed%20walkthrough%20after%20johto%20league`. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily corrupted, but the presence of numerous external links and the redirector URL strongly suggest a malicious intent to direct users to potentially harmful content.

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 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.
  • 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://gettraff.ru/wb?keyword=pokemon%20glazed%20walkthrough%20after%20johto%20league In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f890172d6459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f89c9e917ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8763d34cf14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8854efbe4c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f89e0289bbbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f870ef83204e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f87ac019fa00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f870f879ae1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871bd4008ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8771f4c2e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f88edf0c73de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f89c59e2aa9b.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/1/0437/9607/0549/files/65281888796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2352/2216/files/67990376228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/here_comes_the_hotstepper_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f3dc20-3f5c-4ed2-9348-d889db4a0d85/biruwazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce17a77-b100-4d99-a92c-f5e0ac2f5fb3/47990394234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c50bae3-de76-40bc-82d4-938331f284c1/82817633235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86fa574-61e6-41c2-ab63-f63eeec00a5c/42353208463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c12ce66-ed05-46c5-8694-9c9c67cf6b20/72061961622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2134882a-d8dd-4e18-902b-35554ed9e291/pojod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55547e28-ec7f-4309-b4f5-5b4e05e30611/tuwitulodizabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e5a323-6faa-45ae-b8da-f921c3ccb78f/75288267095.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_off00007d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D03 5428 bytes
SHA-256: e0713b7c13fd348985a31b6edbfd1370a3c47fe904a2603c82a996d725534fb2
font_01_sfnt_off00008f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 10516 bytes
SHA-256: 4c22b46b645990479ee94616f66c14548df872a151fb6d1f8a422a02864abd00

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