PDF malware analysis — malicious · 8138405e91f20322

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 04:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 67b1c7d802d563abf165be2f8f978af5 SHA-1: 857c523a1f45d4a23d6dd4c5d9802e48d141297b SHA-256: 8138405e91f20322ec667c27988efbcbd1cd317e514dd01f7c560314561f9288

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure at ttraff.ru. This suggests a link farm or SEO poisoning tactic designed to lure users to a malicious 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.ru/wix?keyword=quantum+mechanics+david+mcintyre
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0431/1026/9085/files/gukarewosad.pdf
- https://cdn.shopify.com/s/files/1/0437/6834/8830/files/gusafaf.pdf
- https://cdn.shopify.com/s/files/1/0430/3713/0914/files/1824046893.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
- https://cdn.shopify.com/s/files/1/0434/3303/3880/files/93879639190.pdf
- https://static.usrfiles.com/ugd/eb6612_26e723038b664525af3ecfa54e2aeb6e.pdf
- https://static.usrfiles.com/ugd/c7ef1a_71a3a250ea2c4f59b40246f736a3795f.pdf
- https://static.usrfiles.com/ugd/856cea_7c3c8dc98841479eb54b1df23e839501.pdf
- https://static.usrfiles.com/ugd/b8c837_8af242500e944e1386a1ccb6cee31993.pdf
- https://static.usrfiles.com/ugd/4b874d_7273b00b0e38402cbae8d74fdd496857.pdf
- https://static.usrfiles.com/ugd/b8c837_411da9f96bd64d42b5d9faf7ff2e1b4c.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_off00005929.bin` `f06e616b411c68a685b2e79fcf7fefb868b188b685826c16f2c466901aa4e8db`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5929	5368 bytes
`font_01_sfnt_off00006b41.bin` `bc2236cd8b9dbbe1a0d1e4b32d727d2e6e2a9568108f863f6e787f7df067198f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B41	10492 bytes

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