Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e9926693945e1…

MALICIOUS

PDF

49.0 KB Created: 2020-08-16 18:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10e5d379eca3aeaf26507eedffaa609 SHA-1: 8c414ea09a395659c801b1516709dca50ecfa174 SHA-256: 5a4e9926693945e16df276100f02fe44af7c8f8316d929d9446a50b7a0143b02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=because+i+love+you+korean+movie`. This suggests the document is part of a link farm or phishing campaign designed to lead users to malicious sites.

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=because+i+love+you+korean+movie
    • http://files.thesoundingboardministry.com/uploads/1/3/2/8/132814097/b97a0ad.pdf
    • http://ninefenu.osolnikmachinery.com/uploads/1/3/1/3/131398157/4abe327.pdf
    • http://files.whistlepigsaloon.com/uploads/1/3/1/4/131413485/3707546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5778/9605/files/13072246821.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1491/files/glencoe_mcgraw_hill_geometry_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/flight_simulator_x_mods.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/vuxegabupevowukuped.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/broken_vessel_hillsong_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/1869169312.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/apologia_de_socrates_libro_completo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/ford_factory_service_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/baby_sinhala_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/75470588049.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/vipotosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/1420452618.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_off000058f1.bin
97a3ef3a29e9db637ec638cdae961a9118e3f7700ac35caa829ac36bc598eb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F1 12872 bytes
font_01_sfnt_off0000806a.bin
4d34ed0799e0242623cbe5bcd536c93a869cd905797138e78efe84951059fd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806A 5220 bytes
font_02_sfnt_off00009218.bin
ca89d9924184ea39cd80002330d149d6010ddd79d60366ed2c713723f66a48ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9218 10704 bytes

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