Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9314f6d9f77b91…

MALICIOUS

PDF

63.3 KB Created: 2020-11-10 11:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90789b2ae2350153295a9e79555ea7c7 SHA-1: 1852a1daaa1f5c11802f59bdc84b794a24b9b335 SHA-256: 4d9314f6d9f77b915b7d0d40229de431fbb67f1d39a2d248a709216bc6d1b49a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, trafftec.ru, is presented as a search result for 'Garfield games scary scavenger hunt 2', indicating a lure to drive traffic. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=garfield+games+scary+scavenger+hunt+2
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f8acd76298fc.pdf
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/nulopuvosisosegere.pdf
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f9f818c1e09b.pdf
    • https://cdn-cms.f-static.net/uploads/4414847/normal_5fa5a7034744b.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/dibuteloda.pdf
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/6f8595e0.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f96c5d73f29c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/198cf8ed-3af4-4f99-9c17-5a9965b0c24f/wetiduxepoguweminazok.pdf
    • https://uploads.strikinglycdn.com/files/42870a01-d3a6-45c1-ac89-1a8bc6eb0bec/15081972009.pdf
    • https://uploads.strikinglycdn.com/files/1018284e-e066-44dc-ba43-f0c3be3d46e5/18147361849.pdf
    • https://uploads.strikinglycdn.com/files/54b4c309-be05-4f99-9865-20df9eae4b26/bibuvonoluzowilofiliv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae35.bin
af5f16a1dd8b4e5a78b481a901aa277c7b2507d41f4247fb1656808be2b89119
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE35 5760 bytes
font_01_sfnt_off0000c1bd.bin
cf5ed4f450e5fc1fa31c8ac31b5dbd05637a4ba05cdfa332ae769b600578e534
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BD 3024 bytes
font_02_sfnt_off0000cceb.bin
410acb3a4417e4a1361b0134c3282ae1d80af71b97eb5c74840c2f5fa42743dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10368 bytes