PDF malware analysis — malicious · 987d33bd176a0b1c

MALICIOUS

PDF

37.2 KB Created: 2020-08-02 05:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 280c33da908711ec2ba9d5de21e05e95 SHA-1: 7d61537c5a80d7d0e5dd54d50c6e6a84d57c3442 SHA-256: 987d33bd176a0b1ca5051891387c37fb80f4d503bb486c0be4353810537c6f24

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link, https://ttraff.cc/pify?keyword=casio+ctk+2400+manual, suggests a lure to a fake manual or product page. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that this is a link-based phishing or redirection attack.

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.cc/pify?keyword=casio+ctk+2400+manual
- http://files.iknowpavers.com/uploads/1/3/0/8/130874524/garolelujop-xekujomudubulob-watevuzukata.pdf
- http://files.misfitspolitics.com/uploads/1/3/1/4/131453399/2337795.pdf
- http://files.museandreign.com/uploads/1/3/1/8/131856646/76be115e0.pdf
- https://cdn.shopify.com/s/files/1/0434/5567/6568/files/12938730476.pdf
- https://cdn.shopify.com/s/files/1/0430/3156/0354/files/daseduzerososutepo.pdf
- https://cdn.shopify.com/s/files/1/0438/3558/8770/files/wills_eye_manual.pdf
- https://cdn.shopify.com/s/files/1/0435/0767/9397/files/rogufegeforula.pdf
- https://cdn.shopify.com/s/files/1/0430/9634/2695/files/74325707653.pdf
- https://cdn.shopify.com/s/files/1/0434/3123/1655/files/65404175048.pdf
- https://cdn.shopify.com/s/files/1/0433/3335/3627/files/43477775216.pdf
- https://cdn.shopify.com/s/files/1/0433/6176/3480/files/43344520975.pdf
- https://cdn.shopify.com/s/files/1/0427/9477/8791/files/fuxokodeluvugobuzogex.pdf
- https://cdn.shopify.com/s/files/1/0431/9569/5266/files/52440627413.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_off00004bd9.bin` `6ba41d78ccbdd06a30859f63e6ee7a62cbda91fdd3f89e7e1bf08b8d01bad1de`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4BD9	5180 bytes
`font_01_sfnt_off00005d71.bin` `8b52427ab7230d1639d09e3809782b08479a56d827311355f740867b991c4876`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D71	13764 bytes

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