Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fb20080a3eeb43…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 05:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 975da6aa4a21419dc53f27bda201fe93 SHA-1: f59aa37fb286fec41df69f2dc6b2f58a52748aa9 SHA-256: 15fb20080a3eeb43fb16f61bc3e24c53574c30b862642fa78af1e504b3f521cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector, ttraff.com. The document body, though obfuscated, contains text related to 'carcinoid syndrome ppt' and the malicious URL, suggesting a lure. The presence of many external PDF links, some benign and some unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=carcinoid+syndrome+ppt
    • http://zusulevit.christophergennari.com/uploads/1/3/1/4/131437092/kibetimumubube.pdf
    • http://files.monmatgrp.com/uploads/1/3/0/7/130739188/doxazigelexeso_vejez_nolokujowupovi_detuba.pdf
    • http://pugat.hillsidehavenwii.com/uploads/1/3/1/3/131383943/8562274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2735/6056/files/36672209549.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/ssb_stenographer_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7399/files/dividing_monomials_worksheet_8-_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/wepeturositikivixolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/92839697285.pdf
    • https://cdn.shopify.com/s/files/1/0440/9887/9640/files/11797799333.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/jijodajikavadoxilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/believer_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/94194077396.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000697b.bin
5c310b56808b40eb49f174997678c25203aeda500c5c1bd8dc221c1ebff9cb27
pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 5192 bytes
font_01_sfnt_off00007b11.bin
0fbb6181c4c7daa684f6809e099d23e4c8136dc1a432c135476b938ce452dd49
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 12120 bytes