PDF malware analysis — malicious · 85a526152a1d7089

MALICIOUS

PDF

32.8 KB Created: 2020-08-31 02:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ce0611f52298e2623596c0cf9244079c SHA-1: 80e1f12134891698c99d8f0a80bf93ef10075ffd SHA-256: 85a526152a1d7089e40608d906ed2cb18ebdf84c127e437395b26a0f4deddc0b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector infrastructure, disguised as a search result for educational material. This suggests a phishing or social engineering attempt to direct the user to malicious content. The PDF also hosts a large number of links to other PDFs, likely for SEO poisoning or to obscure the malicious redirector.

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=earth+science+chapter+3+review+answers
- https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
- https://static.usrfiles.com/ugd/3f80ec_68865c62d37c4f43a8284aa12dc54dad.pdf
- https://static.usrfiles.com/ugd/a640e9_99a0f471896243eb82e93f2530516a1a.pdf
- https://static.usrfiles.com/ugd/3e87bf_98f8d041104145b8a574a018280b5b82.pdf
- https://static.usrfiles.com/ugd/cb4a18_298ba2a232d64c9cac7ab7455e15d1a3.pdf
- https://static.usrfiles.com/ugd/74e9cf_8ddd5d7788a24ebb92f3eb2c979dc168.pdf
- https://static.usrfiles.com/ugd/451a43_6ac3361f43c94679a168285937162823.pdf
- https://static.usrfiles.com/ugd/b8c837_dd9d5ca1546f425fb01233295b19e73b.pdf
- https://static.usrfiles.com/ugd/ce5d00_d6f3a00feffe442b8e00c20496cb38b8.pdf
- https://static.usrfiles.com/ugd/b8c837_d771a117df0c467e8870d4fd291b8aa6.pdf
- https://static.usrfiles.com/ugd/cf14a4_749c7d1d20cf495c81f95adc642c41ac.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamefidijuj.pdf
- https://cdn.shopify.com/s/files/1/0457/3754/1798/files/16714836307.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_off00004613.bin` `475a96ce4844de0d7ce385b2c4315603810343c3aca75ebef6de3db393a36ef0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4613	5260 bytes
`font_01_sfnt_off00005808.bin` `6cdb98c6d707afaec34970dc5f1482fab74195ef9dd5c534ab0d37f2432efcfb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5808	9196 bytes

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