Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2b4afd6a87cfcc…

MALICIOUS

PDF

45.1 KB Created: 2020-08-21 15:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f8c71a6a31332f333f86561564d681 SHA-1: aa9c3f54fa491bbcee3219c25f5ddf39eb3a7ea9 SHA-256: 8b2b4afd6a87cfcc5f8ae829a30721f068309df53506835c1068c22058d55ea9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a direct link to a known malicious redirector, ttraff.cc, which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to a worksheet, suggesting a lure to trick users into clicking the malicious links.

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.cc/pify?keyword=hemophilia+the+royal+disease+worksheet+answers
    • http://jutibu.metrovinyl.co.uk/uploads/1/3/1/0/131069759/dupewa.pdf
    • http://fijenojil.blackgoldwinterguard.com/uploads/1/3/0/7/130738848/wejubot.pdf
    • http://files.behavinglively.org/uploads/1/3/2/6/132683088/kebadaxibapamite.pdf
    • http://files.remindfulnessapp.com/uploads/1/3/0/7/130775921/6750685.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1194/files/91281586919.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/alfonsina_y_el_mar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/99145189745.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/benojabixemebaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/wokomesetirefevol.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/tumoxogot.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/aci_318_11_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/29728192625.pdf
    • https://cdn.shopify.com/s/files/1/0438/8107/0747/files/87215582686.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/tesunesusasupesoluv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/9738483903.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_off00007249.bin
2b30bde5635fbc96c4838486264e22172bd24d6e8c6ab82c24c0ba9a83d1aae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7249 5416 bytes
font_01_sfnt_off000084a0.bin
a2c227918caf01c3eeeaf343e7395c2756898ff9081cd484ee50d29a98c0f8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A0 10112 bytes

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