PDF malware analysis — malicious · b1cc88994bcad773

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 18:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c5f75e70b0d6f3f690e686214848490b SHA-1: caf512a0ec016068e4b652bc6c07a3a3c4481d60 SHA-256: b1cc88994bcad773923a66619de85870f0558712eac7dd76485ad0ba7b1250fa

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure related to a Korean TV series, suggesting a social engineering tactic. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm designed to distribute malicious content or improve SEO for malicious sites.

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=acuzat+pe+nedrept+serial+coreean+onl
- https://static.usrfiles.com/ugd/dc98cc_a844409284644d7abec6a051a6e5c466.pdf
- https://static.usrfiles.com/ugd/b8c837_a4896846267a44788b3369099de04883.pdf
- https://static.usrfiles.com/ugd/b8c837_fca9b70c27e743ee82280ac60cf0ac31.pdf
- https://static.usrfiles.com/ugd/b8c837_41401a2f0eea43b1b83d15ee84866c36.pdf
- https://cdn.shopify.com/s/files/1/0432/9842/2934/files/91868169376.pdf
- https://cdn.shopify.com/s/files/1/0431/7360/9636/files/blessed_assurance_music.pdf
- https://static.usrfiles.com/ugd/b8c837_26b44f289cf9405e9b6eb01e7ceb64d3.pdf
- https://static.usrfiles.com/ugd/b8c837_74418453645144739cc396119c10d3a7.pdf
- https://static.usrfiles.com/ugd/49be48_fae08f3d6ace44d3b751c9a882b93555.pdf
- https://static.usrfiles.com/ugd/b8c837_65f1f24f46004690bed5ffe0234c6b82.pdf
- https://static.usrfiles.com/ugd/b8c837_9243259f7f6e493eb8af06a6e2d34cd4.pdf
- https://static.usrfiles.com/ugd/b8c837_a644aabf54cd4891aee24555feb8c015.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_off00005ff8.bin` `ccc7b366b144bbedefe40369a995b0d77997690e9187aa2e64e132f7602cfdfe`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FF8	5108 bytes
`font_01_sfnt_off0000715e.bin` `396da5fa621cdaa1c76773cb6c1c601de7f37608e0c88fa4f17d302ce80c0258`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x715E	10452 bytes

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