PDF malware analysis — malicious · ef304223053d427d

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 03:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dde3a1d60470c0d76c9fba0c848702fe SHA-1: 1250bfd3eb1e745f6d4a9b250b3fcccd6aa30066 SHA-256: ef304223053d427d5197d5c9fd72f4b43f2b578ec1edd70ac31f377a32b1ac9d

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm, suggesting an attempt to generate traffic or distribute malicious content. The primary IOC is the malicious redirector URL found within the document.

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.com/wix?keyword=budget+paladin+deck
- https://static.usrfiles.com/ugd/834936_671e0cff2ef047baafb46c2cc452d353.pdf
- https://static.usrfiles.com/ugd/32acb1_f5a2cc69ea224ac183ef406d20bcde7d.pdf
- https://static.usrfiles.com/ugd/e2c250_4756461fc66b47fe9013c2ed45a1af7d.pdf
- https://static.usrfiles.com/ugd/b8c837_4a9d8c3bd2f34959b9573af6e6a70b68.pdf
- https://static.usrfiles.com/ugd/b8c837_709bbebb40af484b85921a52210b3de5.pdf
- https://cdn.shopify.com/s/files/1/0434/1799/3366/files/four_archetypes_jung.pdf
- https://static.usrfiles.com/ugd/b8c837_69835b07f3384104b37017660d06b508.pdf
- https://static.usrfiles.com/ugd/b8c837_52d883453f4549c5a4d7035657ecbeed.pdf
- https://cdn.shopify.com/s/files/1/0431/4241/4493/files/98173045521.pdf
- https://cdn.shopify.com/s/files/1/0430/4296/3613/files/best_book_for_history_of_english_literature.pdf
- https://cdn.shopify.com/s/files/1/0435/3484/4059/files/10500658612.pdf
- https://cdn.shopify.com/s/files/1/0449/3144/9000/files/briggs_and_stratton_6._5_hp_carburetor.pdf
- https://cdn.shopify.com/s/files/1/0436/9724/2262/files/oblivion_natural_environments.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_off00007969.bin` `786b6146ae35df973e956d3c25f00e64bff66b7ffac332ed82e99f8d08b9f492`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7969	5080 bytes
`font_01_sfnt_off00008abe.bin` `c9f5454ea302a53fde10efb7eade471d8a7f0f1c476922b4b11e87ec1284aa2b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8ABE	9968 bytes

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