Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea95e1c2e1199b8e…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 11:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f9dcd39c7e2b7d883670e1e3f17d53 SHA-1: 284f74dac2111fc6ceaec1baebadc6e816e14c9b SHA-256: ea95e1c2e1199b8e3207276b394aba16f83fcd58ed520bf2456cd1a636f8db52
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware delivery site. No scripts were extracted, limiting further analysis of the payload.

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=ejercicios+de+estado+de+resultados+r
    • https://static.usrfiles.com/ugd/b7ed05_ac38a4c42d324c669e0aa38bffe9a7a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e95c97eab8c4b959e761f0896d246b4.pdf
    • https://static.usrfiles.com/ugd/80c1db_e4be0be9aebd40b0ac730ff48f6d77b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_71205bbc53eb4b099c60c9424b31e795.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a08abdde3d64b1598a162903453a622.pdf
    • https://cdn.shopify.com/s/files/1/0434/7058/6016/files/food_vocabulary_list_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0440/8459/2805/files/63916344453.pdf
    • https://static.usrfiles.com/ugd/824332_dd0ed28085fd41c6b1a2bc71d720c57b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0aabbc553d042b99877955f06c725cc.pdf
    • https://static.usrfiles.com/ugd/565485_9db6b4b0e77242c4a1b4f7e4ca5aac89.pdf
    • https://static.usrfiles.com/ugd/6c032c_721df7d4872b40488790033223cd61fe.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.

FilenameKindSourceSize
font_00_sfnt_off00006ab3.bin
d8b47e0522a2353b115f9d8cc1a1d10a0c80fae462aa85aae10387a3039cc501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 4964 bytes
font_01_sfnt_off00007b9f.bin
381afeb73c518da2aa758566a8eb149da838e460d62ed11467886266e722a4dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9F 11480 bytes

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