PDF malware analysis — malicious · 105c83689a6c8ffb

MALICIOUS

PDF

49.2 KB Created: 2020-09-01 15:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e5563d1ac7f32189e5457d881d8ecfee SHA-1: 02f7a21851c2bcc4f496e1abf2285c678b736206 SHA-256: 105c83689a6c8ffbd18bf1a266c3cf32cc924a8c87cb4228d8c41e1633de2405

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, https://ttraff.ru/pify?keyword=cdn_sfl401as.+dll+free, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'cdn_sfl401as.dll free', suggesting a lure for downloading a malicious file. The presence of numerous other PDF links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination.

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/pify?keyword=cdn_sfl401as.+dll+free
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0439/1449/4107/files/flower_wallpaper_for_android.pdf
- https://cdn.shopify.com/s/files/1/0428/2017/3983/files/sobezupefapazu.pdf
- https://cdn.shopify.com/s/files/1/0437/0671/2219/files/sitimudavavovemat.pdf
- https://static.usrfiles.com/ugd/9ea9b6_d92b6042714f4202a747382315c59c30.pdf
- https://static.usrfiles.com/ugd/b8c837_9e964f10dfb44093a9bb5e92cf1760f9.pdf
- https://static.usrfiles.com/ugd/b8c837_4804ca04b30c4059b20f13b35074033c.pdf
- https://static.usrfiles.com/ugd/c1108c_82b456218bf14fca92a47e4ad746acd5.pdf
- https://static.usrfiles.com/ugd/b8c837_d4bbf5e719574c79bce01678a7fabdd6.pdf
- https://static.usrfiles.com/ugd/4b874d_86cf5ebb31774d92a76273aad60916a9.pdf
- https://static.usrfiles.com/ugd/b8c837_d8437edf42124d90af2ed2b0b7ae2280.pdf
- https://static.usrfiles.com/ugd/4cf28d_a7c2f6f62d674eabb5e6797e45172822.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000081f2.bin` `84be3350943350b21322794bac31996bd218e4f09e510b953d466588ffbbdc26`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x81F2	5152 bytes
`font_01_sfnt_off00009399.bin` `049d4aab2b2597c3adc3cf1cbb3eda9099b99c2e8c01646b8be2c384a70dce16`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9399	10772 bytes

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