Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceaae568b5464e3b…

MALICIOUS

PDF

46.3 KB Created: 2020-08-21 14:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05dc27765f99b52b9cb621d34550ae0 SHA-1: c3b1c22bb18ee2cd8978be14d2f97ac77e80f3b8 SHA-256: ceaae568b5464e3b37b56529f581aa4097f633d6725702bff7dab5175bfe7c0a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, forming a link farm. One of these URLs, 'https://ttraff.ru/pify?keyword=world+encyclopedia+pdf+free', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing.

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/pify?keyword=world+encyclopedia+pdf+free
    • http://files.northeastturtles.org/uploads/1/3/1/3/131378923/zudenatasapemoj.pdf
    • http://rajul.red2green.org/uploads/1/3/0/9/130969465/wijeri_zilavowa.pdf
    • http://foroxijo.cassiusapparel.com/uploads/1/3/2/6/132681352/2552575.pdf
    • http://files.norwoodcycleclub.org.uk/uploads/1/3/1/3/131384281/361887.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/hallelujah_to_the_lamb_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/5571812388.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6414/files/byzantine_catholic_prayer_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/vipajobuwonizowalofedude.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/84438071633.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/68901200910.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/vubikobaburemorogusu.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_off0000771d.bin
8b7a584857b95d1920fa3e4b92c1d08e8838105e0fbc51aa76bbce680d76d87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771D 5088 bytes
font_01_sfnt_off0000888e.bin
2437432f968f6c67dbc43becdcac7881f23546dae8dcf172bba68970d32c4c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888E 10872 bytes

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