PDF malware analysis — malicious · 81af0d413b8b61d0

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 06:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: abc8d00869463e4a251092ec752e4708 SHA-1: 94d4279302ad45274a9a0e8ff6f1f8998723f599 SHA-256: 81af0d413b8b61d052d2c3ca2a3057694d0f826762f19fa429a4bbfea64a1eaa

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/wix?keyword=adverbs+modifying+adjectives+workshe, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=adverbs+modifying+adjectives+workshe
- https://static.usrfiles.com/ugd/b8c837_1fd86df1d45b439bb0196b904063b124.pdf
- https://static.usrfiles.com/ugd/9c43ec_ab9f7c1f90154f8dab256c0c17b49088.pdf
- https://static.usrfiles.com/ugd/2f8cea_dc9c5de44f984f0fbacf24240fabae63.pdf
- https://static.usrfiles.com/ugd/850f07_3596b678196040428f89b766f5cdaaaa.pdf
- https://static.usrfiles.com/ugd/b8c837_57ee7638f5774a5db433b2137b2f68e2.pdf
- https://static.usrfiles.com/ugd/41a0b6_d145f97cdd864de7bce6bdee37ff6d82.pdf
- https://static.usrfiles.com/ugd/4479ed_ccdae5fddfd74087a6a334d4843f4b6e.pdf
- https://cdn.shopify.com/s/files/1/0427/8976/5276/files/70529899221.pdf
- https://cdn.shopify.com/s/files/1/0431/4133/3147/files/www._kambikuttan._net_cartoon_download.pdf
- https://cdn.shopify.com/s/files/1/0438/5921/4501/files/statistics_and_probability_with_applications_3e_answers.pdf
- https://cdn.shopify.com/s/files/1/0434/0645/9032/files/tetododolitoduwekopiju.pdf
- https://cdn.shopify.com/s/files/1/0434/1281/6039/files/femizepokunesabe.pdf
- https://static.usrfiles.com/ugd/e33828_8c1a4028d57c4646a5afd28d681d1c57.pdf
- https://static.usrfiles.com/ugd/fb5067_439361b8523e4b80a4504c8ab264cd54.pdf
- https://static.usrfiles.com/ugd/5b5da7_dffded6031144552a0b6c4ab30a595b8.pdf
- https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.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/
- https://static.usrfiles.com/ugd

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000619c.bin` `25bd4efb104f8d9132cf311482412125c5e9c38b0f1474762cf3df9541bb02e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x619C	5924 bytes
`font_01_sfnt_off000075bc.bin` `6642567a6d6db72f8936ea149ff72692c4d19d7da98429c6bdaf71e68f8921dd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75BC	10192 bytes

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