Malicious PDF — malware analysis report

Static analysis result for SHA-256 df55494f4b0a3ad2…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 12:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974deeebd56b4124ef29f25fc009de10 SHA-1: 306722865564743846c2b363795d4452873d4b96 SHA-256: df55494f4b0a3ad2fc5b75839415df1bcf449b351d90246519bb6578221b6724
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=periodic+table+o+level+pdf'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, but the primary malicious URL is the redirector. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=periodic+table+o+level+pdf
    • http://files.charlotte-iphone-repair.com/uploads/1/3/2/8/132814898/30a8df1aade.pdf
    • http://files.theyogaterminal.co.uk/uploads/1/3/1/3/131379776/zulowixawomali.pdf
    • http://files.laopapayasj.com/uploads/1/3/2/6/132681237/685e7756e39.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/hackerrank_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/14309615578.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/bologna_street_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/88328918335.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/hemoglobin_formation.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/voxigatusero.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0439/files/savuziwasonetogorogipeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/2125/4312/files/74011157627.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2965/files/16677513096.pdf
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/java_guessing_game.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_off00007146.bin
21916ee9e5a5550652ba1541e2ccbb4b0c13918bbc26b048b597ddb15277a303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7146 5172 bytes
font_01_sfnt_off000082ef.bin
278d0feb5077aa2d15d70c9a626302dc4dd24abfb92e86256b5c1d82c0c3b9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EF 10088 bytes

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