Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a847f5468bf2b2a…

MALICIOUS

PDF

39.5 KB Created: 2020-08-17 04:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a5fde3b894b49754c12e453b1296b3a SHA-1: d6d2fbf9c224dd58b055c5c7ac1fe76cf3d8beb1 SHA-256: 6a847f5468bf2b2af53de5e8593c8bbb553682fdb3912e3e65438626ac375414
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO abuse. The embedded URLs, particularly the one pointing to 'ttraff.ru', are indicative of malicious redirection. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly suggest an intent to lead users to malicious content or further stages of an attack.

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=answer+sheets+of+upsc+toppers+pdf
    • http://files.glasloughtidytowns.com/uploads/1/3/2/8/132815767/subaxe.pdf
    • http://tuzave.roamsoshal.com/uploads/1/3/2/7/132740405/wajepub-mopeladubafutox.pdf
    • http://files.festivaledelio.com/uploads/1/3/0/9/130969514/2757115.pdf
    • http://files.robinkinney.com/uploads/1/3/0/9/130969811/eeb2d17e34.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/muzibekojoluxanutazawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/apprendre_l_anglais_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/53911943500.pdf
    • https://cdn.shopify.com/s/files/1/0437/8610/9086/files/chemistry_in_action_freemantle.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/satodegojoga.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/80260204705.pdf
    • https://cdn.shopify.com/s/files/1/0436/0654/0445/files/junior_business_analyst_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/47641430051.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/fitefikozutizenegono.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/kexorijuvuvapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/fonurulatovofuzaworinesop.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_off00005e41.bin
8dd644cb182417f5fde50eeb6378a783f533868be71fe4878a2a9fabd3f93638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E41 5084 bytes
font_01_sfnt_off00006f96.bin
30a190762c068fbd1ac2097cc4ced64a7b4e3adfc30f2ac1225ef323bc02adcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F96 9804 bytes

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