PDF malware analysis — malicious · 35a8d164b0c717fe

MALICIOUS

PDF

40.3 KB Created: 2020-08-28 06:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 10ddde63cd71750d4178d051a4a46160 SHA-1: 7fd11b5a4f9e5fbda1fb33ecf734cdb934f5d099 SHA-256: 35a8d164b0c717fe88b8b50f42fb6a732508e3e771661561c424245d2c010faa

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=grados+de+significacion+del+adjetivo+ejercicios`. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com`. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify URLs, reinforcing the lure. The primary attack pattern involves redirecting users to malicious infrastructure.

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/pify?keyword=grados+de+significacion+del+adjetivo+ejercicios
- http://rutinol.sunfloweruk.com/uploads/1/3/1/4/131406427/madad.pdf
- https://cdn.shopify.com/s/files/1/0436/3078/8758/files/61385583478.pdf
- https://cdn.shopify.com/s/files/1/0434/0695/0561/files/xugopoxuvixez.pdf
- https://cdn.shopify.com/s/files/1/0437/8741/9805/files/49435702770.pdf
- https://cdn.shopify.com/s/files/1/0427/8393/2582/files/lageliralowan.pdf
- https://cdn.shopify.com/s/files/1/0431/1895/2612/files/3475599540.pdf
- https://cdn.shopify.com/s/files/1/0432/9072/2469/files/poropabobudujafonafig.pdf
- https://cdn.shopify.com/s/files/1/0438/9725/8136/files/black_lightning_episode_guide_wikipedia.pdf
- https://cdn.shopify.com/s/files/1/0459/6082/2943/files/lemafunatugebakew.pdf
- https://cdn.shopify.com/s/files/1/0431/6997/2383/files/46268140409.pdf
- https://cdn.shopify.com/s/files/1/0428/5959/3894/files/1671968012.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_off00005dc3.bin` `8d0cbdde78ad25b0dbdfe8b9a3ae09b76abd4979a94471b68bd3231607eb0c3b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DC3	5356 bytes
`font_01_sfnt_off00007019.bin` `07580779a3ebb7fb7c36ff9c9cabd55a3c6ec1da757be4ab06c308ee1974d996`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7019	11068 bytes

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