PDF malware analysis — malicious · 3570df287cb5fb1e

MALICIOUS

PDF

40.5 KB Created: 2020-09-10 06:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2f64e051d65f9c99c318ae685a4e2394 SHA-1: b23af7a37fec884f726b94e991cbf4466a2786d8 SHA-256: 3570df287cb5fb1ee57697477ad1d0cc5ec9eb2f600435a7c1b30ff81d0c3c72

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, disguised as a guitar tab PDF. The ML classifier strongly indicates maliciousness. The document body contains the malicious URL and other benign-looking URLs, likely part of a link farm to improve search engine ranking and distribute the malicious link. The primary malicious IOC is the redirector URL.

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.me/wix?keyword=billie+jean+guitar+tab+pdf
- http://vapuro.drbfpalmer.com/uploads/1/3/1/3/131383309/sobadubobibe-lakojuxu-zofapojuru-libuxisaterup.pdf
- http://files.hareandtortoiserunwalk.com/uploads/1/3/2/7/132740511/nitabisemot.pdf
- http://fuwim.classicalhistorian.com/uploads/1/3/0/7/130776795/duvolup.pdf
- https://cdn.shopify.com/s/files/1/0435/9385/9231/files/advanced_english_grammar_questions_and_answers.pdf
- https://cdn.shopify.com/s/files/1/0432/4609/2443/files/convert_pathfinder_to_5e.pdf
- https://cdn.shopify.com/s/files/1/0430/9614/6073/files/cancelling_a_mobile_phone_contract_letter_template.pdf
- https://cdn.shopify.com/s/files/1/0429/8460/3801/files/13549760421.pdf
- https://cdn.shopify.com/s/files/1/0429/2204/9695/files/98105851898.pdf
- https://cdn.shopify.com/s/files/1/0454/2916/2152/files/kogolof.pdf
- https://static.usrfiles.com/ugd/05e3ad_fb2ef27a7c7848dfb999dd7b47cbb516.pdf
- https://static.usrfiles.com/ugd/027f51_0f86755149c44a489d265b6803eeb23e.pdf
- https://static.usrfiles.com/ugd/a18aa6_aa3a1c1d902d4725b188cf375ee7812c.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005796.bin` `87d5a39b630ad7aa7b8ac40a5aeb8c45854b5ffe0767dbbde7bb4bf90ad13811`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5796	5296 bytes
`font_01_sfnt_off000069ad.bin` `76eafa89d3f890c66b80c963cb25a5f25e4fe4b49756e518b88311688df4e1e5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69AD	14116 bytes

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