PDF malware analysis — malicious · 4de8ecbb7e5a248d

MALICIOUS

PDF

37.0 KB Created: 2020-08-30 23:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2f2688307cac9f6daa09cf7afa15e58d SHA-1: 8b7b3f31a776dd692d30796c11fd649154f9a15a SHA-256: 4de8ecbb7e5a248dca04611b2a9c15d43a25d83a81a6109720fc47a760344e1a

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to a domain flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Stihl ms290 parts catalog' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=stihl+ms290+parts+catalog
- https://static.usrfiles.com/ugd/b8c837_ef49ec6bf39c4bb486bb80f5e5d64998.pdf
- https://static.usrfiles.com/ugd/b8c837_e7fd5eb66e724477a6d0ce2aede06bba.pdf
- https://static.usrfiles.com/ugd/b8c837_ba385a38c96a47f6959ba425c99e3d8d.pdf
- https://cdn.shopify.com/s/files/1/0440/6679/9766/files/game_calling_all_mixels.pdf
- https://cdn.shopify.com/s/files/1/0432/7781/1867/files/free_texas_holdem_no_downloads.pdf
- https://cdn.shopify.com/s/files/1/0430/0210/1923/files/rikidozapumupe.pdf
- https://cdn.shopify.com/s/files/1/0459/0144/7322/files/alvin_reid_resigns.pdf
- https://cdn.shopify.com/s/files/1/0434/5203/9328/files/seripajifadozivat.pdf
- https://cdn.shopify.com/s/files/1/0430/3015/1330/files/lamere.pdf
- https://static.usrfiles.com/ugd/271e65_efff2f02c5564b30b0b9da592aadef7d.pdf
- https://static.usrfiles.com/ugd/b8c837_e4070b95493a40ac9285ce3d84f40896.pdf
- https://static.usrfiles.com/ugd/08fe48_73d698569b7343d9b66169a0308c6e55.pdf
- https://static.usrfiles.com/ugd/6240f8_4e0c00f004e64bf09b7c1c6355716635.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_off000050e2.bin` `bfd63f39c071f4fb45731a3277c504f05ad8d982265a3eb202142ae48c87997f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50E2	5880 bytes
`font_01_sfnt_off000064a6.bin` `495445f339a7f57508d4d11eff0955be63a6153946e325d3d82af3a88cb42b03`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64A6	10224 bytes

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