PDF malware analysis — malicious · 547f8a89bccdc9c2

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 23:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c85e77ef29090a42e610fc206c1bacea SHA-1: 04efbab79a4b59d5d4d25bd340b34379f6b6ddf4 SHA-256: 547f8a89bccdc9c23f25f2cca6f9cb644a9ea39698c7fd796922a6e3017c99df

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=hangman+worksheet+generator'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a link farm or redirection strategy. The ML classifier also 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=hangman+worksheet+generator
- https://static.usrfiles.com/ugd/c33cdb_c080ce6d6b3642a29e79da7ffd4e9ae8.pdf
- https://static.usrfiles.com/ugd/0d9a50_baff0f061f0346558f67b3c0bf812991.pdf
- https://static.usrfiles.com/ugd/451461_327dc98f14e64284a2611a2a7027567d.pdf
- https://cdn.shopify.com/s/files/1/0435/1806/6842/files/jewof.pdf
- https://cdn.shopify.com/s/files/1/0436/1817/3086/files/72925911774.pdf
- https://cdn.shopify.com/s/files/1/0433/3253/4440/files/95784997486.pdf
- https://cdn.shopify.com/s/files/1/0432/4763/2548/files/c_programming_language_tutorial_point.pdf
- https://cdn.shopify.com/s/files/1/0437/3010/8567/files/gunaz.pdf
- https://cdn.shopify.com/s/files/1/0460/9723/6132/files/93417480360.pdf
- https://cdn.shopify.com/s/files/1/0428/9685/1103/files/flight_simulator_2018_free.pdf
- https://cdn.shopify.com/s/files/1/0427/9821/9420/files/gijojigatu.pdf
- https://cdn.shopify.com/s/files/1/0430/7963/1012/files/jotodoninidimitani.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_off000072af.bin` `a8d335276effb31f667a2ec352b10c647dc35c2bcba55633d45c1cb80a48b240`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72AF	5184 bytes
`font_01_sfnt_off0000843a.bin` `d01dbcc5e7511517f9c851fd81d2183112115c64331efeb3e5b67bd12092d806`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x843A	10688 bytes

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