Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7c8fede2423b0c…

MALICIOUS

PDF

68.3 KB Created: 2020-08-07 06:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b925cd1887852ec97672c780f9217bb7 SHA-1: ed456678346165855e85af6db91a7ba9cd924df6 SHA-256: 6e7c8fede2423b0c1a4e23b74cfa327eb9b67c52cb459065181f1262cb2f8917
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and references a 'tax treaty indonesia belanda pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further supports the SEO link farm heuristic, indicating an attempt to manipulate search results or distribute content. No scripts were extracted, but the primary malicious activity appears to be redirecting users to a potentially harmful site.

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.ru/pify?keyword=tax+treaty+indonesia+belanda+pdf
    • http://files.threefeatherscreations.com/uploads/1/3/0/9/130970009/8130136.pdf
    • http://files.mrsoneyscomputerlab.com/uploads/1/3/1/3/131398541/3232550.pdf
    • http://files.garealpropertylaw.com/uploads/1/3/0/7/130740174/b7f475989e24ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43692268827.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/lenajelujowaviwowarifigiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/6055/7984/files/resistance_band_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/zumumapawuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/march_past_commands.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/vicks_filter_free_cool_mist_humidifier_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/97620861022.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/temoxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/gerutibuxebapozenutizaji.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_off0000ceb3.bin
4ab8b0ed101a6d958732942c42129d5b9770d50b5b96d4193c376bdb634735f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 5296 bytes
font_01_sfnt_off0000e0cc.bin
52d562fccebabc7439c424dfdecd5550480a9a15d5f19f67828ede0b66d351f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 10376 bytes