Malicious PDF — malware analysis report

Static analysis result for SHA-256 1748a5cef8b6fc3b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-06 05:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c536c5b0990e91fee6cc51d5cbec4b2 SHA-1: e0160ee2d5dd623d2687f3f4a8bd9924090b8143 SHA-256: 1748a5cef8b6fc3b9a3042c488b3bcd0e6548845aadfe072b627bfba09490368
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains text suggesting it is a lesson plan, a common lure for phishing. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm designed to obscure the malicious redirector.

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=sample+detailed+lesson+plan+in+english+pdf
    • http://files.budsdoobieclips.com/uploads/1/3/0/8/130874120/ronajepoxoketo.pdf
    • http://files.mwsld.com/uploads/1/3/2/6/132696598/7790569.pdf
    • http://files.missouriattorney.com/uploads/1/3/2/6/132696030/lositusomozosog.pdf
    • http://files.rrjerez.net/uploads/1/3/1/0/131071256/5122286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/mosinafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/6546277106.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/83392762790.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/rare_candy_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/38650228299.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/vopaduxirano.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/48004650759.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/breakthrough_plus_2_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/a_muralha_da_china_kafka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mizamolapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/vonezagobevenefifawuxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/17495256912.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6993/files/90929793765.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0559/files/40425605562.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f6d.bin
34409677ab682d7878da528d9638925bd1bd45f4075cde5922ecdf68d25312ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6D 5460 bytes
font_01_sfnt_off000081dd.bin
6c24ba185b1794e6a80ccf924c5c1efe1eefa9a1e0579f3862ad2db776ee9afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DD 10272 bytes

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