Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bfdfb98a3dd5a6…

MALICIOUS

PDF

41.2 KB Created: 2020-08-06 09:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8798ce46a1f50e894553591b14379efe SHA-1: 7633f305014b447a8431898713601b358b1d79d0 SHA-256: 61bfdfb98a3dd5a69cc73660a716d19d730323017078580a26dce5a49aca14f0
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to a link farm infrastructure designed to redirect users to potentially malicious sites. The primary link identified is `https://ttraff.ru/pify?keyword=degrees+of+comparison+of+adjectives+worksheets+for+grade+6+pdf`, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to external, untrusted content, likely for phishing or malware distribution.

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=degrees+of+comparison+of+adjectives+worksheets+for+grade+6+pdf
    • http://files.mobcofypsi.org/uploads/1/3/0/9/130969656/vutofixowema-jowavidol.pdf
    • http://files.primepropertiescebu.com/uploads/1/3/1/4/131437474/tonosopurazekuligife.pdf
    • http://files.dancersmovementlab.com/uploads/1/3/2/6/132682542/c136712474e73b.pdf
    • http://files.vccrc.com/uploads/1/3/2/6/132682607/nuderexaz_dason.pdf
    • http://files.nicolasdogwalkingservices.com/uploads/1/3/1/4/131452988/6af8a01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/wp_config_db_password.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/basic_physics_formulas_and_units.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/zezinajajirow.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7469/files/29237531736.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/i5_4670k_overclock.pdf
    • https://cdn.shopify.com/s/files/1/0434/7779/4982/files/45545590715.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7735/files/mitubotozemajage.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/54358721864.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/33237257234.pdf
    • https://cdn.shopify.com/s/files/1/0433/4623/1449/files/case_study_research_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/6436/8021/files/zaxutabovixu.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_off0000601f.bin
116dad143a2939d8b9351eaec0158e3f0a428918cee7b06f357c24c46dc0fefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 5980 bytes
font_01_sfnt_off0000747f.bin
213e309781c6d54dee20e324f95b875e5e9cb1edadf60354516c19b8d99201cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 10180 bytes

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