Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81c2f241441ded7…

MALICIOUS

PDF

59.7 KB Created: 2020-08-01 05:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 180c6ac47a084cdb1b2d3744425a2acc SHA-1: d16399b3a8660a61e0a97f730d9b2f90e2154b6d SHA-256: e81c2f241441ded7d34f1b6fc8e6993a09dea90f1679a9af060f72412c6420ef
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to PDF files hosted on various domains, which is indicative of a link farm. One of these links redirects to `ttraff.com`, a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lead the user to a malicious website or phishing page.

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/pify?keyword=asus+n66u+firmware
    • http://files.purplebutterflyphotography.com/uploads/1/3/0/8/130874633/tudavidevejosen-bajinitonon-zamibozu.pdf
    • http://files.henrytyrrell.co.uk/uploads/1/3/2/6/132680852/fuseduwu_piwerisowewosi.pdf
    • http://files.keithrobertson.org/uploads/1/3/1/6/131606789/ridudixu-noxep-kotaxupiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/67046099488.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/jivufuxixezijidegawabudar.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/vilorenojunoninolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/minevajamu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/98301817359.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/sabatujafeparanusav.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/bukikixavelufotunosafib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/mvn_skip_tests.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/xodidatelizukat.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/rupabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/kojovitilizugoxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/96231351004.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/keletezemapokojuwerer.pdf
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/22932062392.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/22138008060.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000931f.bin
c3e834ceaadce2679d5f6c6270867d78e2c37108edaf90cdbd1140e5dc3b22e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931F 3104 bytes
font_01_sfnt_off00009e3e.bin
1326d33d362912dbd3243add97eb60b0fa7d74ea6666fae9afe705ef79dd82fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3E 5116 bytes
font_02_sfnt_off0000af9f.bin
220711cee943dd23414e5bb65fd41dd1bb590c7967141b57e1be6fe4558e8ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9F 15868 bytes

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