PDF malware analysis — malicious · aec74eac7ef71433

MALICIOUS

PDF

117.9 KB Created: 2020-09-01 23:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 348e1dc71d681a3c536e671aec43e3a9 SHA-1: 6ddc9a33a6516a423522231a7c7e0fc4deed614e SHA-256: aec74eac7ef71433a502e7778900bba3fac9a4bff8cd091372de4f77331ed14b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, includes the same URL and keywords suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The primary malicious indicator is the redirector URL, which is likely used to funnel victims 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/wix?keyword=tamil+christian+songs+free++starmusiq
- https://static.usrfiles.com/ugd/b8c837_382089968a264baaba5a155b3e37488c.pdf
- https://static.usrfiles.com/ugd/9ff9b8_3ff4fa90ba7143a8bd71585f02ba1c1f.pdf
- https://static.usrfiles.com/ugd/0cd019_4d2f39bdd7094989bf17612931bbf693.pdf
- https://static.usrfiles.com/ugd/ca300b_2d911eb0db664539afa799fcae1447e1.pdf
- https://static.usrfiles.com/ugd/191a6d_669312e800634b7f905d3e7c3dbe60db.pdf
- https://static.usrfiles.com/ugd/b8c837_1ee47d256e764390bb80a568278c3939.pdf
- https://static.usrfiles.com/ugd/314c35_da1bf7c71b5a4365b4144240696edc3a.pdf
- https://static.usrfiles.com/ugd/97634b_def838f9837748ffb543e25578dd1e09.pdf
- https://static.usrfiles.com/ugd/47b1e8_855d0383d9da43a5a1cc1e8d9ec305ad.pdf
- https://static.usrfiles.com/ugd/0b1cf2_8f1cafe6705349fa82c231bd148b2ff1.pdf
- https://static.usrfiles.com/ugd/5af86b_f4eaa68350fd4e6cb8e3e6dc2ba10047.pdf
- https://static.usrfiles.com/ugd/e6092c_4d4aed4cffcf4a1f925ac3848b3d16d4.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_off00018af2.bin` `8299998e070370f26f3146f6425e14881f37c1cd9d40cc9d2119459b651fda50`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18AF2	5372 bytes
`font_01_sfnt_off00019d00.bin` `ab7c930b86b990785fd0051bdaf8a0fe49861d2a02d436ec6a0530cfcc76da41`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19D00	14936 bytes

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