Malicious PDF — malware analysis report

Static analysis result for SHA-256 a024bf8ff208839a…

MALICIOUS

PDF

41.1 KB Created: 2020-08-17 03:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac9f1326e03648fbff461811a1395997 SHA-1: 269aaf006629c4d884965af6c0311ff023639c8d SHA-256: a024bf8ff208839a9a9ec855ec0bc17d1d1f1c68e520097735cb0db92388abd7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a redirector URL, which is a common tactic for distributing malware or leading users to phishing sites. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, likely designed to improve search engine rankings for malicious content. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=android+studio+emulator+no+internet+access', is the primary IOC, serving as the initial lure.

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=android+studio+emulator+no+internet+access
    • http://files.taichirutland.com/uploads/1/3/0/8/130813054/kejifitulezimo_moben.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/bigasotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7829/files/fuvajik.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/napuwigovefuwib.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/2484837339.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5790/files/dipig.pdf
    • https://cdn.shopify.com/s/files/1/0451/2422/3141/files/el_delito_de_blanqueo_de_capitales_isidoro_blanco_cordero.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3090/files/tapesami.pdf
    • https://cdn.shopify.com/s/files/1/0453/6303/6315/files/zared.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/pangngalan_pantangi_at_pambalana_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/nujofutebanetuduweranuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0151/files/batch_convert_xlsx_to_csv.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_off00006375.bin
54c20cd7ade291b5982e9f1962516dfb2e0900f8c2268bc054a5497633664302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6375 5072 bytes
font_01_sfnt_off00007494.bin
1273113cbfa3ce69f1dc415a4d898f61e3ab284e664b73f76631dd88cb32e79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7494 10300 bytes

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