Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e883db6d90bda4…

MALICIOUS

PDF

40.1 KB Created: 2020-08-11 20:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00fd0d21c06ba8e338a0205563d2aaea SHA-1: c8ecb1a13a79584d63ba87124fb06a0cbc42f668 SHA-256: b3e883db6d90bda4f926f8c40db669b9a9374ee9f453fdc83c9cb5e75422e34a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=lines+of+symmetry+worksheet+pdf+with+answers'. This URL is embedded within the document body, disguised as a worksheet with answers. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, luring the user to a malicious site.

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=lines+of+symmetry+worksheet+pdf+with+answers
    • http://sonutini.egamposol.org/uploads/1/3/1/4/131453194/vojabutagubexa_gewumemol_kegimuxapolodos.pdf
    • http://files.cuaahumboldt.org/uploads/1/3/0/7/130738712/megizefepax.pdf
    • http://pawatapaj.daankahmann.com/uploads/1/3/1/8/131871390/zugolilixum-nipexusevedex.pdf
    • http://files.makingsiliconebabies.com/uploads/1/3/0/7/130739069/besirukin.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/34442963192.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/spanish_articles_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/rejobedesalekomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/91704999045.pdf
    • https://cdn.shopify.com/s/files/1/0437/4872/0789/files/dixewiberitosekoba.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/rosugogide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/funefetefusoman.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/tasobuwumafilibupor.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/10800184788.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/65163530591.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/17032486802.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_off00005e8d.bin
ae6769648e77b1b5b99db7c71b2697a546b989a8f922346675e9387e8c65262c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 5448 bytes
font_01_sfnt_off00007105.bin
d5d5f4079ba0413baab6896ecc062c4043fa278d2559f9d41ee56abab86b181b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7105 10008 bytes

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