PDF malware analysis — malicious · 7f9ceb2ef402f68d

MALICIOUS

PDF

46.9 KB Created: 2020-08-29 10:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cb639a11397bfbcdd078dccdbc0df120 SHA-1: 760aaf387161105e7af7bb58aee1bd0f83c5affd SHA-256: 7f9ceb2ef402f68d7c1a3dc2fe0f82602832e3eb81cddf2df26899e2d084ef00

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a phishing or malware distribution site.

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=le+pervers+narcissique+et+son+complice
- https://static.usrfiles.com/ugd/b8c837_e71686ae0bf54d148562e98766d6f469.pdf
- https://static.usrfiles.com/ugd/b8c837_a5fdf1e2391744ed851fe6f5b12bb720.pdf
- https://static.usrfiles.com/ugd/b8c837_fa7b1e0f07fe4643adc12cdd748febc5.pdf
- https://static.usrfiles.com/ugd/b8c837_35f58c7f1bdb4e2b92f86599e2795825.pdf
- https://static.usrfiles.com/ugd/b8c837_00eae8365d8344c89a035ff6106dbf7a.pdf
- https://cdn.shopify.com/s/files/1/0434/8447/9641/files/adverb_clause_of_concession.pdf
- https://static.usrfiles.com/ugd/b8c837_762f175373ab44aab00df0b588113560.pdf
- https://static.usrfiles.com/ugd/b8c837_23aa52622ae04cd6862ec580406df94f.pdf
- https://static.usrfiles.com/ugd/b8c837_108fc8ab29a64a10a410ea0c5d2b291a.pdf
- https://static.usrfiles.com/ugd/b8c837_898770e7ec754087a8c955dc77b1dd1f.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_off000066fe.bin` `70d588bfe1dacf33d63ab0c8e47a7ed3c4260aa126c5ce464eb122436b68205d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66FE	5088 bytes
`font_01_sfnt_off00007839.bin` `f08d56aa9c1bb67f53e8f77e4fa5ca14348d90ad2f5dcd199904555b0bce154f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7839	12320 bytes
`font_02_sfnt_off00009f48.bin` `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9F48	4324 bytes

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