Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a85927ccd864452…

MALICIOUS

PDF

39.4 KB Created: 2020-08-04 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4b1917b3a3d6b9a4dd2f879fa1f4f87 SHA-1: cce47a34603db0d4a85000df2fe81ac5937b6170 SHA-256: 8a85927ccd864452a8791fc5690ee7b59ef2fe1c4aa5516c7adaa48e5bf72084
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=longman+academic+reading+pdf'. This URL is designed to lure users under the guise of providing an academic PDF. The document also contains a large number of external PDF links, many hosted on Shopify, which is characteristic of SEO link farm abuse. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=longman+academic+reading+pdf
    • http://lutumava.bournvillebowlsclub.com/uploads/1/3/1/3/131380845/7564229.pdf
    • http://robewu.fasystech.com/uploads/1/3/0/9/130969204/lobamolijasi-valibagodaf-fufafobepiz.pdf
    • http://refewabat.teamworkexcellence.com/uploads/1/3/1/4/131453060/ladoxesogejuru.pdf
    • http://files.rotoruayachting.club/uploads/1/3/1/6/131636988/7463475.pdf
    • http://files.hoopspulse.com/uploads/1/3/1/4/131454221/9328cb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/chapter_4_time_value_of_money_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/82754012805.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/tosekuwisujazekowunavora.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/9906113871.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9748/files/montana_300_try_me_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/kesunagorazalawalefuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0960/files/john_deere_js40.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0025/files/teroku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9242/7430/files/newoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/faxakurev.pdf
    • https://cdn.shopify.com/s/files/1/0430/8585/6919/files/29630291334.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/windows_8._1_pro_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/the_client_list_season_3.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_off000057a2.bin
eea95d657d923ba59eeade7c474cca34dc78d8fd1dcfb9cbfa17b019eb29cd4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x57A2 5208 bytes
font_01_sfnt_off00006947.bin
3ce49283d589e3aedff01bcc39b1eeffc5e3b6c9e881ee3c43b794799a45d4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 13600 bytes