Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57c53aae86cf15…

MALICIOUS

PDF

42.6 KB Created: 2020-09-05 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad823e3264e39a9c97848dd31830efe1 SHA-1: 731ce9b3d18b1e5eda1e78fd0ddbbda26a59326e SHA-256: dc57c53aae86cf15d9c9ad98c2c6d816054143ac35adb37196c5b92ad5562b46
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=core+java+interview+questions+for+experience+pdf'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for 'core java interview questions'. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=core+java+interview+questions+for+experience+pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/98195255018.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/alligation_and_mixture_short_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/barbie_dress_up_games_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/satusabalisisebanafag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/kigevukuwek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/tenebozekolopiredo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/3348598889.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/75785744542.pdf
    • https://cdn.shopify.com/s/files/1/0438/1802/5122/files/43516832361.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/zijopuzalaramomufafap.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/carole_and_tuesday_album.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/popodopugitepifuritar.pdf
    • https://static.usrfiles.com/ugd/5b604d_0578d90ce41c425ba79fa343c18964da.pdf
    • https://static.usrfiles.com/ugd/64d889_ce4951cdc70d40afb418aa0993dbc1c1.pdf
    • https://static.usrfiles.com/ugd/f08e01_c9fc7d0ba3d24effad9ee4e18b82cbd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92030c7ddb24f22bdaf166238472d78.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_off000067aa.bin
9bdae0af7804eaa8e7abd2d08e33fbae422c0e6c802539e51202501d4e2b79a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x67AA 5444 bytes
font_01_sfnt_off00007a54.bin
ccced2015d9565e577a75a79e4d40d52ac96c6c9fc8ce6a068d3b15d1bcbb316
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 10156 bytes