Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f010cbe63e0422…

MALICIOUS

PDF

40.4 KB Created: 2020-08-19 07:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e701ca25496271f4b6fe00592e415446 SHA-1: 049f83636610e7aa918cf4fad05eb5f9348fc79a SHA-256: 15f010cbe63e0422ccab58277470787466880a80a5a16714127c1c40712af708
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL related to cracking software. This URL leads to a link farm of 24 PDFs, suggesting a tactic to distribute malicious content or SEO spam. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the redirector link, reinforcing the malicious intent.

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=autocad+2014+crack+64+bit
    • http://files.nicolejonestroy.com/uploads/1/3/1/4/131437149/vaduses.pdf
    • http://rinuz.joeganech.com/uploads/1/3/1/8/131871717/616e218.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8590/5576/files/baluniruwekasoraw.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/cryptic_crossword_telegraph_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/online_to_word_converter_ocr_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9686/files/icy_veins_brewmaster.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/xedesoxipawof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/95867780688.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/pixixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/raxaxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/ripovagix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/95835156021.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_off00005c32.bin
e799cef8a774e0bbf297178789b9b119178aa82a8d1a46eb5448a1addf36f905
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 5484 bytes
font_01_sfnt_off00006ee2.bin
5a8b2d899fcc88a1deeb4dc3ad03cc2a542ada03b0c6cf68719d8ff388cb86b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE2 11012 bytes