PDF malware analysis — malicious · 20728c333e41ea8b

MALICIOUS

PDF

74.8 KB Created: 2020-12-22 03:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 140fbc495d6e556ac110f5fb4294acb5 SHA-1: 7e229a01ff4dd5a3be71db8bcb208a29d2ea018a SHA-256: 20728c333e41ea8b1760ced073e573b753921cbba4ab2e19c3725755e9c5bf1e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm with 26 external links, and one of these links points to a potentially malicious domain. The ML classifier also flagged the PDF as malicious with a high probability. The document body, though heavily obfuscated, contains text that could be interpreted as a lure, such as 'Play chip's challenge on android', and the file metadata indicates it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

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.
External URI info PDF_URI

PDF contains an external URL action
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://traffnew.ru/aws?utm_term=play+chip%2527+s+challenge+on+android
- https://cdn-cms.f-static.net/uploads/4390324/normal_5fd880ef38cfc.pdf
- https://static.s123-cdn-static.com/uploads/4481155/normal_5fdd27e8b6bbc.pdf
- https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3590787.pdf
- https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/tetavoze.pdf
- https://cdn-cms.f-static.net/uploads/4373755/normal_5fae0faa51197.pdf
- https://biwireteput.weebly.com/uploads/1/3/4/1/134131636/4385146.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/defujo/letter_of_recommendation_for_volunteer_job.pdf
- https://s3.amazonaws.com/xuxifuzituwu/ascendant_one_moba.pdf
- https://s3.amazonaws.com/xukonakefules/skyrim_anisotropic_filtering_performance.pdf
- https://s3.amazonaws.com/fasanag/mivetilifusogibonajolo.pdf
- https://uploads.strikinglycdn.com/files/b4a2406d-be2a-40f9-8f69-a34241dfaee7/fireb.pdf
- https://s3.amazonaws.com/tarizirefevifab/52839284227.pdf
- https://s3.amazonaws.com/widiku/weight_destroyer_program_free.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e51f.bin` `62ef4dfba0f9ca0098f949c10721e56bf63dd2572a5154fd80475597ab05ba7a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE51F	5472 bytes
`font_01_sfnt_off0000f7c5.bin` `16d3aafa7a0fdd1aca22ee93797db72d5b03c46af06641ccb48eae52cfd62715`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7C5	11464 bytes

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