PDF malware analysis — malicious · 16601d2dc79893b6

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 03:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 00226b26c00fd88e26d5e35501914594 SHA-1: fd1a0546c09ac953532d933a0c9372362096d90d SHA-256: 16601d2dc79893b6de8cbfa1d6d6ffe31f303706e73b4661d515c9633f7f4d36

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to a search for 'Blackberry keyboard android 9'. It also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further 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/pify?keyword=blackberry+keyboard+android+9
- http://kunal.chatinfrench.com/uploads/1/3/1/3/131384708/sagituluxega.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0440/2121/9493/files/rerituma.pdf
- https://cdn.shopify.com/s/files/1/0432/3812/9823/files/21072871687.pdf
- https://cdn.shopify.com/s/files/1/0432/1391/4276/files/asterix_indonesia.pdf
- https://cdn.shopify.com/s/files/1/0433/8388/1893/files/80874320724.pdf
- https://cdn.shopify.com/s/files/1/0429/2083/7279/files/tilozefazofosabaxojajod.pdf
- https://cdn.shopify.com/s/files/1/0429/4567/5420/files/79525377602.pdf
- https://cdn.shopify.com/s/files/1/0437/3915/2535/files/lowes_zion_crossroads.pdf
- https://cdn.shopify.com/s/files/1/0434/7107/7526/files/brandon_sanderson_starsight.pdf
- https://cdn.shopify.com/s/files/1/0434/2149/9548/files/12549357054.pdf
- https://cdn.shopify.com/s/files/1/0431/4392/1820/files/59387499669.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_off00005f0b.bin` `48ed6e7c05e74c6a8251729b391e7a36064592d24ee98272a8053d03f560d1d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F0B	5264 bytes
`font_01_sfnt_off000070ff.bin` `68561312cb6309cbbce2d2063228b145c13b8571ada7d07969919c8b9dd8b201`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x70FF	10520 bytes

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