Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0b46b496389f29…

MALICIOUS

PDF

35.0 KB Created: 2020-08-13 12:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb6bd6a8db2998b05b3e9e3a1d15bf0 SHA-1: 2505dfa5b780ce2f451529d8e19e3f96c926d5fd SHA-256: 9c0b46b496389f29671896517f3ac215ff9cf3f7e17e68ad04e05a0720321b1c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.ru/wb?keyword=english%20phrasal%20verbs%20in%20use%20cambridge%20pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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/wb?keyword=english%20phrasal%20verbs%20in%20use%20cambridge%20pdf
    • http://nabejupa.makingwithwords.com/uploads/1/3/2/7/132740541/zotavesivurijul-zixobirexajuso-todofulepep-tikuleze.pdf
    • http://files.happycamperllc.com/uploads/1/3/0/7/130740553/3305569.pdf
    • http://fozutuw.humanehomesnc.com/uploads/1/3/1/4/131453133/benudaxulaxe.pdf
    • http://pumepabe.peterdumbreck.com/uploads/1/3/0/7/130775350/62717ceda477.pdf
    • http://files.calliebell.com/uploads/1/3/2/6/132681832/6062104.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1906/files/let_me_ride_that_donkey.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/dmv_dl_44.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/52923490156.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/67455498047.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/us_cellular_rebate_center.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/44120069321.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/46653341178.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/wawutas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0950/6471/files/gujabofavimemife.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_off00004a03.bin
744f259044e771dc670ead82ac965cc25d49d627f31de36185948cfafbf0d8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A03 5724 bytes
font_01_sfnt_off00005d55.bin
e2197da3ee6b05e71eba3d2de29aa5bcba932b9c78726567b9ab1f341b1391c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D55 9876 bytes

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