PDF malware analysis — malicious · 9540e9648a8250f8

MALICIOUS

PDF

31.4 KB Created: 2020-09-01 05:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 10f0398e9a5444bd9faa47f57e289b25 SHA-1: 24cde79b15819b00e9e08cc41a8c16813c75665f SHA-256: 9540e9648a8250f8629c784d8bb43295db6f5446bd5d335a8045c04f4d6e53d9

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, which is a common lure for phishing or malware delivery. The presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting.

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=linear+inequalities+worksheet+tes
- https://static.usrfiles.com/ugd/b8c837_58c5f55c75c84c9092c1cbd7f236a16d.pdf
- https://static.usrfiles.com/ugd/b8c837_601bd766f9cf48d49a9be0e25766fe9d.pdf
- https://static.usrfiles.com/ugd/b8c837_4435acaf8f07454098913d9b1539bec5.pdf
- https://static.usrfiles.com/ugd/d4a9d6_3f210b1a2eb2469d9cff24994d468c44.pdf
- https://static.usrfiles.com/ugd/bf0735_65ffd5ec4670423ba989604e355e85bc.pdf
- https://static.usrfiles.com/ugd/b8c837_6f9bac77e7bd439588c58f39a9531f0f.pdf
- https://static.usrfiles.com/ugd/b8c837_6212f1430b58437d84a577fc1e1c08ef.pdf
- https://static.usrfiles.com/ugd/c1108c_6b2914ddb1014bb4a5311c345e184b92.pdf
- https://static.usrfiles.com/ugd/469aea_b1e8aea692f44951abc5514c506dda39.pdf
- https://static.usrfiles.com/ugd/cafc24_952267362b4c40008f0df79b55b64c89.pdf
- https://static.usrfiles.com/ugd/bb13a2_ab1d2cf787e249539c9b268d6d7b51ae.pdf
- https://static.usrfiles.com/ugd/b8c837_dde8d2c32830414096a45273f73a64fa.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_off0000429d.bin` `a01308f9da82c3f66ac3b13169d7692eb11a990003c1f7c2f3bf6efa73c682a8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x429D	4996 bytes
`font_01_sfnt_off000053b0.bin` `617301a373582da40ff2a2c5b00d986c5e286398c1b5dd4a4f66bfddb870d24a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53B0	8636 bytes

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