Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb4e7dc6d63ad0d…

MALICIOUS

PDF

51.6 KB Created: 2020-08-19 12:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 327475dbe79aaa045c71710e6ff5b055 SHA-1: d0b2cb4d158517fc85f9d0fcebef60054cf022e3 SHA-256: 7fb4e7dc6d63ad0d7c775ec9bbfeb874290e17d1e0dc50268bbd23495887ee01
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=mathematical+operations+questions+and+answers+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious links as academic content. The presence of numerous PDF links, many hosted on potentially compromised or low-reputation domains, indicates a link farm or SEO poisoning tactic to distribute 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=mathematical+operations+questions+and+answers+pdf
    • http://files.culturalartnetwork.org/uploads/1/3/1/1/131163550/2350439.pdf
    • http://files.grayboxprojects.com/uploads/1/3/0/9/130969817/memevubukaboleteluza.pdf
    • http://nobararav.sgvha.com/uploads/1/3/2/7/132740405/4bb32.pdf
    • http://lusij.ashlynnsboutique.com/uploads/1/3/1/0/131070786/ludizatifun.pdf
    • http://dokagosa.rockintdranch.com/uploads/1/3/1/4/131406970/300f4926e.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/research_article_review_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/basic_of_java_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/49814502304.pdf
    • https://cdn.shopify.com/s/files/1/0437/1585/4490/files/kuzaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/71900998933.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/core_java_practice_programs_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/sivemuzigem.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef4.bin
79ba4bb6c930b4094ad7c9d1284659a9b94ec6e1bde3db08fa6b555e08ea4118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF4 5500 bytes
font_01_sfnt_off0000718d.bin
ee68113739f20b87b2c2af24e890c3d78c6c61356ba55a7f725f413469e64c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x718D 13312 bytes
font_02_sfnt_off00009c27.bin
e62c858c4bfb0cbb41e66f6202ad2833c136164b7d6efaed4ec76821c444b125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C27 16472 bytes
font_03_sfnt_off0000b238.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 4324 bytes

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