PDF malware analysis — malicious · c585edc4abbbbb98

MALICIOUS

PDF

39.4 KB Created: 2020-08-29 04:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d81d66cf64078cf38373bdddac32f35a SHA-1: 56026a6e3da59998de64eb55145f570447eddefb SHA-256: c585edc4abbbbb98e278dcf5e4e5c5eacc234da54f712b50c9c6cb4225ffb617

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to a known malicious redirector, disguised with a lure of "Printable trivia questions". The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body itself is heavily obfuscated but contains the malicious URL.

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=printable+trivia+questions
- https://cdn.shopify.com/s/files/1/0434/7248/6566/files/remabugetudumeladaveped.pdf
- https://cdn.shopify.com/s/files/1/0437/8689/5522/files/fwiw_urban_dictionary.pdf
- https://cdn.shopify.com/s/files/1/0428/5346/6271/files/merge_free_online_tool.pdf
- https://cdn.shopify.com/s/files/1/0448/0227/7542/files/poruvofetibeteb.pdf
- https://static.usrfiles.com/ugd/b8c837_1e95c97eab8c4b959e761f0896d246b4.pdf
- https://static.usrfiles.com/ugd/b8c837_f0cd584adfd84226944bf179f5467e41.pdf
- https://static.usrfiles.com/ugd/b8c837_46727d6a9e3a44e880657e6f3428764c.pdf
- https://static.usrfiles.com/ugd/b8c837_a77fcee47bbc407a82ad57eb7e063926.pdf
- https://static.usrfiles.com/ugd/b8c837_dbd07f14ab5f45fd859c2f79901bb49b.pdf
- https://static.usrfiles.com/ugd/b8c837_e0ec9d01b5224ac2b0db595c21313d7c.pdf
- https://static.usrfiles.com/ugd/b8c837_6c465caafb6245ab8528534a815fc2a9.pdf
- https://static.usrfiles.com/ugd/b8c837_a76236dc6014450881049cea60c599ec.pdf
- https://static.usrfiles.com/ugd/b8c837_456d002bd15c4264bd5030bdd5c535c5.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_off00005d31.bin` `cb4218f07a99a0c00af2a39b261a520d253376e85a962a99c01f30149a2e87e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D31	5004 bytes
`font_01_sfnt_off00006e44.bin` `1c27306c1159cc91b884ceed069bdc9a19b1e15524b9efa25da1f96a2742d330`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6E44	10240 bytes

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