Malicious PDF — malware analysis report

Static analysis result for SHA-256 d392cfd7aa97a910…

MALICIOUS

PDF

59.1 KB Created: 2020-08-15 15:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a092b8918c9ca7954286a83e0da6a0 SHA-1: 4701cde57c8b41907c9cf38d06a7391d82b07cb5 SHA-256: d392cfd7aa97a910c4e7d76228e16715915cc9172acb78a0b6624efec876a86e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'public speaking skills' and a URL that aligns with the malicious redirector heuristic. The presence of a large number of external PDF links, many hosted on Shopify, suggests 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/wb?keyword=public%20speaking%20skills%20for%20students%20pdf
    • http://bulikito.bangsarsouth-properties.com/uploads/1/3/2/6/132680949/6989950.pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/fomivusawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0521/files/gusetasusurajanum.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/rimworld_max_room_size.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/luwakanumibulotenedimuwuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/30106106277.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/training_learning_needs_analysis_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/non_governmental_organizations_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/jivavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/rovek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/tolewagixinoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/main_topic_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/94531658317.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b28.bin
3bd30679e70feb936fe5a02f70382b9ae0ad38ba80563c9ae862ee597198d9bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B28 5412 bytes
font_01_sfnt_off0000ad87.bin
51b26113a02542af81e8db79eb466c81f2b1d3014eb9a77e3e8a3ce00dd4e6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 10624 bytes
font_02_sfnt_off0000d159.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 4324 bytes

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