Malicious PDF — malware analysis report

Static analysis result for SHA-256 4158f4416ad2ccdc…

MALICIOUS

PDF

34.6 KB Created: 2020-08-06 12:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bbac4ff71f27c1da2c4bdcebd8a15b8 SHA-1: b1288d4d64352e214e30361625098c8b0e527bf0 SHA-256: 4158f4416ad2ccdc105874ae4a8e273661eb28b9ae8108ab4f7ed710ef4c7756
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document is identified as a malicious redirector, likely a phishing lure. It contains an image-only screenshot designed to trick users into clicking a link. This link, https://ttraff.ru/pify?keyword=guia+ceneval+psicologia+contestada+pdf+gratis, leads to known malicious infrastructure. The document also contains a large number of embedded links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility.

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 34 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ttraff.ru/pify?keyword=guia+ceneval+psicologia+contestada+pdf+gratis
    • http://files.myoridefitness.com/uploads/1/3/2/6/132696111/nilegeb_junov_bufibax.pdf
    • http://files.familyconnectionscounseling.net/uploads/1/3/1/1/131163559/9901975.pdf
    • http://files.innerdolphinawakening.com/uploads/1/3/1/6/131606035/kumuvefajolen.pdf
    • http://files.metalgardenbeds.com/uploads/1/3/0/8/130873846/d12e8ad72351.pdf
    • http://files.teamdalbon.com/uploads/1/3/1/3/131380008/9813851.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/75121510689.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/wolisinepevotofevinafuti.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/xotesijurozefuvok.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/joxekududu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/fadamujiripejivulobaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/9705132896.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/vowakesakiresodapopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/rewaxagamejolojujona.pdf
    • https://cdn.shopify.com/s/files/1/0429/3463/2607/files/64910407612.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/64417377433.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/nemorogapegegilom.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004280.bin
98609e4a217e413b9e7a2d9977b3e1df85cd151960fb941146aaa60222b4aa41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4280 5296 bytes
font_01_sfnt_off00005493.bin
a0f3bed34655551000f2004a8854baddda1eefa9aecb4636c2a1b3ba0d1112ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5493 7820 bytes
font_02_sfnt_off00006f1a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1A 4324 bytes

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