Malicious PDF — malware analysis report

Static analysis result for SHA-256 136586e61ae260e9…

MALICIOUS

PDF

49.8 KB Created: 2020-08-15 02:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ca610afa485c2084a426a8b180a688 SHA-1: 7b9186c206b168aa4ee03c7ae97b71e39edcbca3 SHA-256: 136586e61ae260e9bb79243a33c0dd077c0ff739dff36c4de39f34faa1ec8ef6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=tower+defense+android+source+code', suggesting a lure related to software development to entice clicks. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=tower+defense+android+source+code
    • http://bodiba.terriermath.com/uploads/1/3/0/8/130874493/3560970.pdf
    • http://files.ohioheartgroup.com/uploads/1/3/0/7/130775197/cd7ecea0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/invitation_meeting_template_email.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/74475921068.pdf
    • https://cdn.shopify.com/s/files/1/0453/2492/7131/files/11th_botany_practical_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/3471/7858/files/plan_bus_aix_en_provence.pdf
    • https://cdn.shopify.com/s/files/1/0435/8465/1423/files/dabekolagepemujusakifosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90296180399.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/24066659414.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/rowab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/47906739882.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/28457427598.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/jaduzolowofagatuxoxexoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/99652400160.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/gabojatilavedimajidubuza.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/cheats_for_gta_san_andreas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076de.bin
b3141b5cbbcb0216ef6a1ce102ec8d3a88d4adf251e7530b0d3db50798a376b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DE 4824 bytes
font_01_sfnt_off00008762.bin
b0415ea5ffc75c8f3268bf600d14ce26ace3b9437205e156d064515fd5a8fa34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8762 10820 bytes
font_02_sfnt_off0000abc4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 4324 bytes

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