Malicious PDF — malware analysis report

Static analysis result for SHA-256 f652f2ea27c87aa1…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 06:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11175f1f8b4bc2598f46fd68146fd735 SHA-1: bc7c5a9447670220d918d6f2fe4720d45e228099 SHA-256: f652f2ea27c87aa132996879667f91b321371600946bad8fef131462c098c3f5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one to a known malicious redirector, ttraff.com. The document body, though partially corrupted, contains the same URL and a list of other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring the user to click a malicious link disguised as educational 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://ttraff.com/pify?keyword=define+conformational+isomers+in+chemistry
    • http://files.nancyjcompton.com/uploads/1/3/1/4/131437736/ruvukix.pdf
    • http://files.quillcbd.com/uploads/1/3/0/7/130776254/bipoxumunuluf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/tabakera.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/taputawenewa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0999/1075/files/xizozofufetozegezemelik.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/18905079749.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/blender_2._8_tutorial_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0447/8546/7558/files/nesilojugilixapekomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/49827036781.pdf
    • https://cdn.shopify.com/s/files/1/0428/9144/4390/files/92855262688.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e6.bin
732e3946d4cb52975b805b9d3368590a561cac47d1e5161a56f09559f3cc11e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E6 5220 bytes
font_01_sfnt_off00006b7b.bin
523691b51f3bf32edca5bf17713835a373edb9b5d15cda8a2f2d60b634134be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 10548 bytes

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