Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6f0514adb1e5b8…

MALICIOUS

PDF

84.1 KB Created: 2020-08-08 07:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8367cad4710f36a04c8f75073e8d73c SHA-1: f169f875fe30333dc38c5379d4c66df9f8e6ada7 SHA-256: bd6f0514adb1e5b808b6e58df56e02d0af5d13da7071d7404eeac0dad0a712d1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URL is a redirector designed to send the user to a malicious site, likely for phishing or malware distribution.

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=important+abbreviations+related+to+computer+pdf
    • http://files.jeongyang.org/uploads/1/3/1/3/131379724/a31caa2f505.pdf
    • http://zatapezo.uufcm.org/uploads/1/3/1/4/131453541/900080.pdf
    • http://files.the-green-school.org/uploads/1/3/1/4/131409210/f4b705a07c.pdf
    • http://files.heatherlynngilstrap.com/uploads/1/3/1/4/131452935/5132197.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/74973088643.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/51641378752.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/analytical_reasoning_aptitude_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/vogojuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/26074368165.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/gesesilivijebururok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/rozipeduworo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/xbox_one_controller_driver_error_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rokagarunawawutasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/gogulanemuxumoxesan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/kedabafigelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/28105612008.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_off0000f23d.bin
b363801a3eb95e01f4e9275cef94021f1ff89bb88e0bb23ad8b8308a5c1619c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 5320 bytes
font_01_sfnt_off00010430.bin
9deb9b60c6cf1f9cf8b36796c81ccd37820c01779e8b44e2481bd031360f00f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 15728 bytes
font_02_sfnt_off00013484.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 4324 bytes

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