PDF malware analysis — malicious · af7a1049b8dcff55

MALICIOUS

PDF

34.9 KB Created: 2020-09-01 04:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d04e1449ee9a2096a7ff14046f553c1f SHA-1: 0838ef249f4d33d456f958c69b2fe4ccaa04be14 SHA-256: af7a1049b8dcff55e8c8be58aec3e7574b67f3d85c613d8c2d2d61f4c550c0a3

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though obfuscated, contains the target URL and references 'English brushup pdf', suggesting a lure. The ML classifier strongly indicated maliciousness, supporting the finding of a 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.ru/wix?keyword=english+brushup+pdf
- https://static.usrfiles.com/ugd/b8c837_36f795abd3b949db8dc0e130d915d187.pdf
- https://static.usrfiles.com/ugd/b8c837_59949572ef224a429e28f6d3bc829e4a.pdf
- https://static.usrfiles.com/ugd/6f9b04_9d7e45436d804bbe9ec64b95d8cb387b.pdf
- https://static.usrfiles.com/ugd/02beb7_98ae32f7aa994ffcb09ad9d4e24eb86e.pdf
- https://cdn.shopify.com/s/files/1/0437/8460/1752/files/nowawuxafidodu.pdf
- https://cdn.shopify.com/s/files/1/0434/3355/8182/files/79623309705.pdf
- https://cdn.shopify.com/s/files/1/0431/5113/0785/files/my_favorite_mistake.pdf
- https://cdn.shopify.com/s/files/1/0437/2958/4293/files/cambridge_primary_english_stage_6.pdf
- https://static.usrfiles.com/ugd/b8c837_f0e49f6ad0a14d05a1beb18eea53b9f2.pdf
- https://static.usrfiles.com/ugd/9c43ec_9b3ec5067e014afeb671ae8e1f6fa21d.pdf
- https://cdn.shopify.com/s/files/1/0428/6588/5351/files/rudoxunogof.pdf
- https://cdn.shopify.com/s/files/1/0438/3480/2333/files/pelopivavenem.pdf
- https://cdn.shopify.com/s/files/1/0432/1650/2939/files/41528493100.pdf
- https://cdn.shopify.com/s/files/1/0433/0523/8688/files/22565647831.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_off00004abc.bin` `8dea2a50fbd0fe03f06113dc98af713ce0ef8bb6cdaf22ff4a30df0ea12aa429`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4ABC	5188 bytes
`font_01_sfnt_off00005c5c.bin` `34971ff604fda8b2691afcb1808debaa5525cd8907fc8e6e8c9d46db4f3af375`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5C5C	10264 bytes

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