PDF malware analysis — malicious · 3d02f16c3b668d76

MALICIOUS

PDF

43.8 KB Created: 2020-08-28 23:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fa71c7f768315db76fc80078041b4ffd SHA-1: d2265a281912c489fd49e2464d679ba0aa4ba9f9 SHA-256: 3d02f16c3b668d76af3f2d57d1b2b4515567b5b67df9a7c2442227c1b7057637

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector URL is a high-priority IOC.

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.ru/wix?keyword=rare+pomeranian+colors
- https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
- https://static.usrfiles.com/ugd/b8c837_274da813579f432e9db73af3b685073c.pdf
- https://static.usrfiles.com/ugd/b8c837_bf40f4c26e664fb09c7741a6be1858b6.pdf
- https://static.usrfiles.com/ugd/b8c837_770529f384cc46e985d680319b9a3c68.pdf
- https://cdn.shopify.com/s/files/1/0433/2794/6904/files/rijag.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
- https://cdn.shopify.com/s/files/1/0434/9073/8328/files/inquisitor_greyfax_rules.pdf
- https://cdn.shopify.com/s/files/1/0440/4995/7029/files/zijopexusozijezux.pdf
- https://cdn.shopify.com/s/files/1/0441/1441/1672/files/53881539429.pdf
- https://cdn.shopify.com/s/files/1/0433/2758/6457/files/loxibubotekomemutaxogi.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000624b.bin` `6b3e4a3dd3f47ec13ce956444f2d8169d669710ec97773ee342ca323ddcbb293`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x624B	4796 bytes
`font_01_sfnt_off00007266.bin` `a11dfa6bc847988af554e90455cfca07c989c0e941b6e9fe8e8d50c9b35f2806`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7266	10000 bytes
`font_02_sfnt_off00009455.bin` `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9455	4324 bytes

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