Malicious PDF — malware analysis report

Static analysis result for SHA-256 749dc0dbb9b7b6fb…

MALICIOUS

PDF

46.6 KB Created: 2020-07-19 18:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7e4e845e6d8ab42e934c0ba1bb714a0 SHA-1: 613166a889b91f2ff919c72a3049aa7e83c8334a SHA-256: 749dc0dbb9b7b6fb6a1820aaefe2ae80f91afec26c9487ffa6b93d7e1353fa46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru). The document body, though heavily obfuscated, suggests a lure related to a "study guide". The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of the PDF.

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=minerals+and+rocks+study+guide
    • http://files.ryanleekk.com/uploads/1/3/1/3/131398573/bivaj-piwuj-foganun.pdf
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdf
    • http://files.bjspoultry.com/uploads/1/3/0/7/130740521/8996003.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/52767458511.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/25737704982.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/pogusisarezitomaleforipi.pdf
    • https://patibubu.files.wordpress.com/2020/06/sipaxanapezoxonapofuf.pdf
    • https://xodavosubis.files.wordpress.com/2020/06/16634959316.pdf
    • https://forivugovov.files.wordpress.com/2020/07/16601594894.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3789/files/panizezokixokulutoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/70709255362.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/46518000737.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/66513292259.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/lakiguguvosubuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/kokizesovatiwovoxin.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/24013837996.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/
    • https://patibubu.files.wordpress.com/2020/06/sip

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007903.bin
bbc4a2d196e61bee12c4e051cc138e09f8998b85e28649c0c23ed51ceecb0665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7903 5160 bytes
font_01_sfnt_off00008aa5.bin
f3978a9d8e127483c1f46b4daaef8a7717a2fff099cf346416e09b42a0bfa844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 10108 bytes

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