Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a24fa351fd2934d…

MALICIOUS

PDF

45.4 KB Created: 2020-07-20 11:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed27383b5c7c2ef6bc2ba1bb9e48d7fa SHA-1: 80c178f16f066761681d4f556fc81db359812270 SHA-256: 3a24fa351fd2934d7d978fa94d435ad4c644192a2246ecccb016f30f0f91aa6a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a redirector associated with malicious activity. The document body, though heavily obfuscated, appears to reference a book title, suggesting a lure to disguise the malicious link. The ML classifier also strongly indicated maliciousness.

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=rosen%2527s+emergency+medicine+10th+edition+pdf
    • http://files.wernerkaffl.com/uploads/1/3/1/0/131070230/kisutopeb_panobexazed.pdf
    • http://files.sapnajawidpiracha.com/uploads/1/3/1/4/131407080/pudizewiranabel_tazejubigelune_sasugubovafo.pdf
    • http://files.ellensorganicgarden.com/uploads/1/3/0/7/130740213/xefezupuzoxo-lobefufiwibali-zatofow-mudofeguzix.pdf
    • http://files.elizabethtownchristianacademy.org/uploads/1/3/1/3/131384359/4ff6bdbdecc3b.pdf
    • http://files.ellensorganicgarden.com/uploads/1/3/0/7/130740213/xefezupu
    • https://cdn.shopify.com/s/files/1/0429/0360/1308/files/tolenobosarazisiguneso.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/silazovujepijativoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/33663373018.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/9895726268.pdf
    • https://gozadadud.files.wordpress.com/2020/07/80496996048.pdf
    • https://lunivaja.files.wordpress.com/2020/07/fefagatodininibomisegowez.pdf
    • https://dulaxagaro.files.wordpress.com/2020/07/kapaz.pdf
    • https://vudofuj.files.wordpress.com/2020/07/tijunituzekozedagib.pdf
    • https://bexanoru.files.wordpress.com/2020/06/4292376700.pdf
    • https://cdn.shopify.com/s/files/1/0440/8089/0008/files/57036447464.pdf
    • https://cdn.shopify.com/s/files/1/0431/0656/6306/files/wefakalexume.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/piwitodefuxabapar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7994/2812/files/29022607638.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wozofedotomutigetipire.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/lidarodutukox.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/99958465920.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_off00007146.bin
47e097116e8cba100583632c8011e3a291a5a3ee75b9eea48b3a2b9d85d0b912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7146 5452 bytes
font_01_sfnt_off000083bc.bin
d71899fe9a8984495cec3ed7fa010c2c3a98fa9e0db7cf7b42645d76ac62dfcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BC 10352 bytes

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