PDF malware analysis — malicious · 82077e9f3e4ece13

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 01:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dfe8c3ed2ac785c556c331b6cfe86c0a SHA-1: 56cb2d7aaedf0cdf2f2bb071cb0c7a6b33bff8cb SHA-256: 82077e9f3e4ece13ea49a3e343054ece33636cae0bb049715f33f1d8b754a001

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with the primary one directing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading a modified application, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=assassin+creed+identity+mod+apk+data+obb
- https://static.usrfiles.com/ugd/a2e20a_9bd60fbf691a470695969eb43550fe1f.pdf
- https://static.usrfiles.com/ugd/c3f88d_42256ca4013a4d20b04aa22f63bd43a9.pdf
- https://static.usrfiles.com/ugd/5cf23b_82356da246f045afbe1ad38a1bca9a1b.pdf
- https://static.usrfiles.com/ugd/67e251_cd65e4761cf2436c8dea0e3f2f3c6f69.pdf
- https://static.usrfiles.com/ugd/b8c837_2d41640d3c184fca8f35edf71921ecee.pdf
- https://static.usrfiles.com/ugd/e8506d_7cbe564b06c2469b960be947316ce317.pdf
- https://static.usrfiles.com/ugd/b8c837_4ffe5edcb4a54baeb9ebfe90d70fc474.pdf
- https://static.usrfiles.com/ugd/7603ae_66c0159cad344d3585975aac2c125b02.pdf
- https://static.usrfiles.com/ugd/b8c837_e85dd171fe154ea7a1a64fa96965ea2d.pdf
- https://static.usrfiles.com/ugd/b8c837_8a03a118122a442e9961a8327c638190.pdf
- https://cdn.shopify.com/s/files/1/0431/4267/6648/files/celta_reading_lesson_plan.pdf
- https://cdn.shopify.com/s/files/1/0435/9897/1038/files/84582675166.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_off00006704.bin` `7e69e28047b71dbbc936a014beb76f62fd6e8314bb942a70ec460dcdc4c9e961`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6704	5484 bytes
`font_01_sfnt_off0000799a.bin` `33943dde12367fa196ff6f46fc73bde197e071b3eb68e2c67072471c1b2177ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x799A	10468 bytes

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