PDF malware analysis — malicious · 36849f487cac1cd1

MALICIOUS

PDF

32.7 KB Created: 2020-08-31 22:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f2b42da57b5660d36963c192038abb1e SHA-1: e8c4dfd4aa66e5892ffada0485bad06c21e12b33 SHA-256: 36849f487cac1cd142afbed0ef00c611598417e5f8a96aa0890b5244acc375b0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains embedded links that point to a known malicious redirector infrastructure. The document body, though heavily obfuscated, includes the URL that triggered the heuristic. The presence of numerous external links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. 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=london+grammar+interlude+piano+sheet+music
- https://static.usrfiles.com/ugd/625844_6589d8aa45a6404aa57598abbecc0806.pdf
- https://static.usrfiles.com/ugd/b8c837_5be4f193f219455d8047db8ff99135ce.pdf
- https://static.usrfiles.com/ugd/913720_73e1acc1725d4505bc3326f61ef105ac.pdf
- https://cdn.shopify.com/s/files/1/0430/2703/8359/files/birozasewerutufa.pdf
- https://cdn.shopify.com/s/files/1/0435/1574/0312/files/mawozujobudopitax.pdf
- https://cdn.shopify.com/s/files/1/0429/9702/2871/files/epinephrine_davis_plus.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
- https://cdn.shopify.com/s/files/1/0433/3328/8088/files/vue_directives_cheat_sheet.pdf
- https://cdn.shopify.com/s/files/1/0429/0835/2679/files/82088698164.pdf
- https://cdn.shopify.com/s/files/1/0437/1107/0357/files/pokuripajabajetoxa.pdf
- https://cdn.shopify.com/s/files/1/0430/7828/7513/files/jumunizeme.pdf
- https://static.usrfiles.com/ugd/b8c837_df862a985ff243a591942ac85a3a11a0.pdf
- https://static.usrfiles.com/ugd/6da380_b678d9663aa1432d9f333eeb25869f1b.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_off0000436b.bin` `ca4e022b23d033b5660539cedce9a970d1ce9d497a9e7a9c10efceb7acf9c1e7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x436B	5428 bytes
`font_01_sfnt_off000055b5.bin` `115213af0fc280adeacbb88ae6b8193d30f5083e3a934a80baea5700dc6129b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x55B5	9460 bytes

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