PDF malware analysis — malicious · a0ccb2cf408fa113

MALICIOUS

PDF

37.5 KB Created: 2020-08-30 08:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f31d0bad035434c8621bff843d564d6c SHA-1: dcf65fa16adfd24cec403088781d4e617c8b10c4 SHA-256: a0ccb2cf408fa113d6c0f03e28980504883aa29b678216bbe2693be0224c5768

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as an 'indirect speech exercise for class 5'. This indicates a social engineering attempt to trick the user into navigating to a potentially harmful site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=indirect+speech+exercise+for+class+5
- https://static.usrfiles.com/ugd/b8c837_60555049390642529381efb17e044f90.pdf
- https://static.usrfiles.com/ugd/2c8d66_e45e9b46dc754e908c7dba68f24c4765.pdf
- https://static.usrfiles.com/ugd/b8c837_8fd79bb1f9024c4aa36f6bef30a955dc.pdf
- https://static.usrfiles.com/ugd/b8c837_5c3f0db402aa4661add6d593c1d3be1b.pdf
- https://static.usrfiles.com/ugd/b8c837_16d77500cd1d46fa8b209575995d7c32.pdf
- https://static.usrfiles.com/ugd/cf79db_525a70a935604e4e8459ccd28263451b.pdf
- https://static.usrfiles.com/ugd/7f16bd_6aebc1d6303a44daae2233129b638496.pdf
- https://static.usrfiles.com/ugd/b8c837_43597533810547daa7ba4c2ad732d0a5.pdf
- https://cdn.shopify.com/s/files/1/0462/9138/6529/files/kijukazepogonifugunenux.pdf
- https://cdn.shopify.com/s/files/1/0429/0736/9639/files/medial_meniscus_tear_treatment_guidelines.pdf
- https://cdn.shopify.com/s/files/1/0428/8059/8172/files/lepozadopetalera.pdf
- https://cdn.shopify.com/s/files/1/0433/1539/6776/files/bijeb.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_off000054c8.bin` `949b2a9f433f52b1774a704be463e6bea2d6517949fd5db66258bf99bda472e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x54C8	5372 bytes
`font_01_sfnt_off00006706.bin` `7a93cfc1777acd16daefd68a40974ea7c0839e40a105c349099e9b91aa2fb3da`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6706	10084 bytes

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