Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f746b95ec5fe36…

MALICIOUS

PDF

69.8 KB Created: 2020-08-10 04:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b37160288b1be7baa1cbfd61b37c2c3 SHA-1: 5f8d9c571ca2c83412b46006fd895bfa6a857979 SHA-256: 77f746b95ec5fe363300b754eeb8011c2a38b049cca7439a78d05e8fe08c8d52
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic, suggesting the document's primary purpose is to redirect users to malicious content.

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=ankylosing+spondylitis+symptoms+pdf
    • http://tefolir.designs-by-nathan.com/uploads/1/3/1/4/131453041/5797017.pdf
    • http://files.drbrettwade.com/uploads/1/3/1/8/131871864/xagenozatububu-worejixenub-goxolixiwamub-xenex.pdf
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://files.godshousenyc.org/uploads/1/3/1/3/131381055/6936447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/upside_down_question_mark_alt_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/11885823393.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/bopabuvomukekumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/btu_meter_for_chilled_water_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/71216413101.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/29424143700.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/gapejerupajufel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/48867681028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libutufisolefod.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/tensorflow_check_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9944/files/guzuwelagesusupiruvajaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/17004429175.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_off0000d485.bin
f2a3ea2425200aff1573847dd755e6a725ac83b815ff8411b51957aa28d86515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 5208 bytes
font_01_sfnt_off0000e649.bin
500ae4d319fd13d9a08157ab3641bc67744eab7ea7b18219e61eb40b2320b5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 10404 bytes

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