Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15157fb0eee04bb…

MALICIOUS

PDF

47.9 KB Created: 2020-08-09 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ba8eb1db7b47d8b69ad0f916adb53a SHA-1: 529b662cd46f7f2e9df50029d94b942b4ac4cea4 SHA-256: d15157fb0eee04bb284cc7d903063f3a15ac2e6bf0ced5e69dc51fab0bda0ea4
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure via the URL 'https://ttraff.com/pify?keyword=abdomen+agudo+quirurgico+obstructivo+pdf'. Another critical heuristic flagged it as a PDF link farm, with many URLs pointing to external PDF files hosted on Shopify and other domains. The document body contains garbled text but includes the same suspicious URL and several Shopify URLs, suggesting a lure or redirection mechanism.

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=abdomen+agudo+quirurgico+obstructivo+pdf
    • http://files.larte.us/uploads/1/3/1/3/131398097/wetedifot.pdf
    • http://files.openheartshelpinghands.com/uploads/1/3/1/4/131438442/mogadabamox.pdf
    • http://files.whittaylorcomics.com/uploads/1/3/2/7/132740595/kevotamefakulus.pdf
    • http://files.franklinyartey.com/uploads/1/3/1/6/131606901/jazadevojexere-dajumotoli-dewivuboxuxufe.pdf
    • http://files.monmatgrp.com/uploads/1/3/2/7/132712199/2924916.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/32495349487.pdf
    • https://cdn.shopify.com/s/files/1/0435/3081/3589/files/99803467333.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/92854874371.pdf
    • https://cdn.shopify.com/s/files/1/0437/0209/1929/files/alkyl_substituents.pdf
    • https://cdn.shopify.com/s/files/1/0455/4902/7493/files/8321421637.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/berunogomesatusote.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/44346104550.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/89333149544.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/toniwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/77748427494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.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_off00007a86.bin
3ee918a415a3e6fd1b7df9a250571204beef8c1dfcef9ffd2958a9e38dd0940b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 5760 bytes
font_01_sfnt_off00008e02.bin
dbf61ea6dbb819f06d3d0dfa479c5f54947275eb7498e3555a296835c744159c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E02 10728 bytes

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