PDF malware analysis — malicious · 81c557fa7fd79e3f

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 05:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 3826e6b268016129503d5b04e898fc63 SHA-1: 4a06ba36c48cbdea108422be3bb7d792bc79f46c SHA-256: 81c557fa7fd79e3fe41e66d567087c6e723d1dd9d5bb50ac0b85e8dcf7d5c668

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains multiple embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain references to this redirector and other URLs hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm or redirection tactic to deliver a payload.

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=advanced+dungeons+and+dragons+intellivision
- https://static.usrfiles.com/ugd/c5d40f_5503d3868a63429d96e0f0e1ada2b641.pdf
- https://static.usrfiles.com/ugd/fb5067_8ba1e2eb35f64f81a7489e7e53726587.pdf
- https://static.usrfiles.com/ugd/91e123_3f0b04089d834530b08923c56e82a9fc.pdf
- https://static.usrfiles.com/ugd/bca722_29ed5934fabb46da90d2b451bd3a0fff.pdf
- https://static.usrfiles.com/ugd/921909_3896837efd2448f7ad9ae5f8fcf924e9.pdf
- https://static.usrfiles.com/ugd/b914b5_540a9aed080c42ef94a7c53ef8ac7723.pdf
- https://static.usrfiles.com/ugd/8ab72e_242cd869ee8049bfa05b73ce8c200103.pdf
- https://static.usrfiles.com/ugd/724fb5_a44dfcd095ef4796b4c92cd272e83794.pdf
- https://static.usrfiles.com/ugd/b8c837_9c7f8045d3244e7bbbeaa3b1f5973342.pdf
- https://static.usrfiles.com/ugd/9b7d8a_3b9d95d7cc2a46fe85b4e06f54e18c67.pdf
- https://static.usrfiles.com/ugd/b8c837_ae2353dbd8ff440390744f326616ca06.pdf
- https://cdn.shopify.com/s/files/1/0434/5787/2033/files/figakoreru.pdf
- https://cdn.shopify.com/s/files/1/0447/9765/7254/files/73235805458.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_off00005bcf.bin` `498dcbdbec784246736f0a21c668f90ab183e6a5aab58e794b96f04c435a875d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BCF	5156 bytes
`font_01_sfnt_off00006d68.bin` `a0eba927b46ad33df537a8ecfaf6f82ee018c47f5a4076726e11b66095ca23bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D68	10472 bytes

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