PDF malware analysis — malicious · 5826950b061f41bf

MALICIOUS

PDF

59.2 KB Created: 2020-09-02 01:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 27142d9a3696813de3df7e7837b4acd4 SHA-1: 134cae867c7c18fc55141aaa4acfee22d785ca65 SHA-256: 5826950b061f41bf2531dd3228339d897580e6a4078ef8f5dd26076b86f4f470

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it is a primary lure.

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=normally+formed+macerated+stillbirths
- https://static.usrfiles.com/ugd/3ab5ed_bfe179b052914196922be44b3dbc94a0.pdf
- https://static.usrfiles.com/ugd/938c70_24e46ce6aa854c6b831fbada6bd44444.pdf
- https://static.usrfiles.com/ugd/6812d7_3bf187bec14a47fcbfbe6e88f12849b7.pdf
- https://static.usrfiles.com/ugd/be19e1_dd69f59e71a7434abf5752f33fdb918a.pdf
- https://static.usrfiles.com/ugd/15cd4d_ef66aa4994b5460ab40585ed18688d17.pdf
- https://static.usrfiles.com/ugd/7a7fb1_6129d6ad2e57424e823e0f3c2e09b04e.pdf
- https://cdn.shopify.com/s/files/1/0427/9628/6111/files/game_theory_examples.pdf
- https://cdn.shopify.com/s/files/1/0429/2476/9436/files/xusamilenugekedavogabu.pdf
- https://static.usrfiles.com/ugd/b8c837_d92dd37c3518400786591cc6da3b1405.pdf
- https://static.usrfiles.com/ugd/b8c837_d213e5ac65fd492b880f73973d457cfd.pdf
- https://static.usrfiles.com/ugd/87a178_7498708f68b34b22894ae0b065366c17.pdf
- https://static.usrfiles.com/ugd/b8c837_f28915aefff245bcae49073376a60597.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_off0000a9df.bin` `900136c92b920312da816e7fb56e020078fe4d987c4b62446161b1226bb15f60`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA9DF	5472 bytes
`font_01_sfnt_off0000bc5b.bin` `f495bbd96dcda7b300eec43526b39e643ccb81901e78c01011f2801196548e4c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC5B	10384 bytes

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