Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5289ec6daac6303…

MALICIOUS

PDF

71.4 KB Created: 2020-08-31 05:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13715d2b928b0d4f2edf45bc04fe0f52 SHA-1: 4cf7467880e595798bb8931f157a2d7fc675c58f SHA-256: d5289ec6daac6303a9e5f5312d6e0acbbaa431f5a2aebe8d4f8de9ae46a9515c
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. This indicates the document is designed to lure users to a potentially harmful website. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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.ru/wix?keyword=danmachi+memoria+freese+dispatch+guide
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/26519521586.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/buku_cerita_dalam_bahasa_inggris.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/ruziponeranifedajilufebeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/rusedunekuvasin.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/benim_hocam_kpss_tarih.pdf
    • https://static.usrfiles.com/ugd/b8c837_7dc2931988214758ae7ed0004285d4b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3020d7d9c3fa4affaa29f456dc8a2463.pdf
    • https://static.usrfiles.com/ugd/b8c837_c970f4ca78c74065a324323e999182f0.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/1720475712.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/54930274777.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/sirunilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/jexupujaretik.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/ninopusafubezad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab2d.bin
887d9c40c6096a0114abb84e2a75e970b94c7c1574faf5dbcbcb9c82f81bbf1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2D 3084 bytes
font_01_sfnt_off0000b641.bin
ca086e2e79a72b12c30cdf4891fb2391af002316407dc5bb43888324af2ec9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB641 5536 bytes
font_02_sfnt_off0000c8df.bin
4a7c4f2a0c3e9829691dd119fd95001a8722a861617d2ff7b451b60f246f3ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 16024 bytes
font_03_sfnt_off0000fa72.bin
84104170df5398e43001d314eff03f449fcca15f87a71b12300aef8e2695b0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16136 bytes

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