Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b76bf726b3c99da…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 09:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4619c9ea6023f6a1a4167fbdc58ea929 SHA-1: 9d0bde191757ff15c1e6e12854b43c638abea6d7 SHA-256: 3b76bf726b3c99dabc35501d00461dd7482f94733509113a61bc15caa1617412
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though partially corrupted, contains text suggesting it's an exercise PDF, likely a lure. The primary malicious IOC is the redirector URL, which is used to funnel victims to further malicious content.

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=le+verbe+avoir+present+exercices+pdf
    • http://files.wvangler.com/uploads/1/3/2/6/132681586/fibudatib.pdf
    • http://files.emmanuel-umc.org/uploads/1/3/2/7/132740338/wemuforot.pdf
    • http://files.charmsandsparklebyria.com/uploads/1/3/0/8/130814855/vadoremuneminubis.pdf
    • http://files.blacktriviabooks.com/uploads/1/3/2/6/132695194/9644589.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/87680405830.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/delutuwovesumewaminaxo.pdf
    • https://cdn.shopify.com/s/files/1/0453/2423/9003/files/article_critique_sample.pdf
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/zojapalivozavibuvus.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/fe_civil_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/21712942053.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/suguru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/1341312985.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/81086747925.pdf
    • https://cdn.shopify.com/s/files/1/0439/3225/4376/files/95999639572.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/jajogulekujil.pdf
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/tojetixifalopafele.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/xefitu.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_off00005389.bin
92008feec2c0f793646f6ef8662176ced6eef7bef3185f9d2f77e484abab21f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5389 5328 bytes
font_01_sfnt_off000065be.bin
1b036746c19fa44c603e902a8ddba290d305479a6695a3d401ea0e94606ef0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 11840 bytes

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