PDF malware analysis — malicious · f3d1cd3676f04f2a

MALICIOUS

PDF

32.3 KB Created: 2020-09-08 13:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d4cf17d771602f3fb17b5858ff6e16c9 SHA-1: 64bec0e7d203dfab6d0ba607fe19d35a13280f60 SHA-256: f3d1cd3676f04f2acbd91f251f3d21fd706e5fa6ca58831dc82bebec42eb6a26

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this finding. The presence of numerous external PDF links, many pointing to benign content, suggests a potential SEO poisoning or link farm tactic to obscure the malicious redirector.

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/pify?keyword=khachaturian+sonatina+1959+pdf
- https://static.usrfiles.com/ugd/b8c837_2a7ab4fa13ef4a3381c92a1aa9ddd512.pdf
- https://static.usrfiles.com/ugd/d2751c_7d4383b1a3074ec6af79f0dbabeac279.pdf
- https://static.usrfiles.com/ugd/405339_396b964d33874aff9329b6bfb569486e.pdf
- https://cdn.shopify.com/s/files/1/0432/7908/9824/files/joviligimusolarizir.pdf
- https://cdn.shopify.com/s/files/1/0433/3276/3801/files/error_installing_rmagick.pdf
- https://static.usrfiles.com/ugd/5ed537_00d4943f644d4b8d9bebbe8685a08081.pdf
- https://static.usrfiles.com/ugd/fa32a6_362d09584463418facec2e17efaa0553.pdf
- https://cdn.shopify.com/s/files/1/0462/3892/4960/files/breakthrough_eddie_james_sheet_music.pdf
- https://cdn.shopify.com/s/files/1/0437/4216/7189/files/xerostomia_review.pdf
- https://cdn.shopify.com/s/files/1/0447/8877/7126/files/calendario_semanal_2020_para_imprimir.pdf
- https://cdn.shopify.com/s/files/1/0434/5511/9513/files/weviwukigitupu.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_off0000419e.bin` `517b91951fbbec430a46a31c524b9b23ff71dcf0fe70b5535cd6b57dba46a7d7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x419E	5512 bytes
`font_01_sfnt_off00005462.bin` `89c71305aa4816bde3e313f17a54a59c56a9ca9b8799ab104c145275f9bfe2fb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5462	9468 bytes

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