Malicious PDF — malware analysis report

Static analysis result for SHA-256 87238ea261e28cb6…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 02:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a824901d1e04827a2a5ff73426aa21 SHA-1: beb80a516936984933ceace65471c41bd06baf73 SHA-256: 87238ea261e28cb6cabb7a763fb89679924431ebf801758f590501877d0f295c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Zener diode as voltage regulator pdf notes' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious content. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports the malicious intent.

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.com/pify?keyword=zener+diode+as+voltage+regulator+pdf+notes
    • http://files.vantjones.com/uploads/1/3/2/6/132682905/tamijib_xomisi_gatofoba.pdf
    • http://sopet.kvarnertrails.com/uploads/1/3/0/8/130814297/pekatitedelenosijom.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/vixakidilutidat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4933/files/xezifikaxugupewu.pdf
    • https://cdn.shopify.com/s/files/1/0447/7675/1261/files/lakshmi_narasimha_kavacham_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3881/0010/files/mejanasod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/56313013059.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/97860196840.pdf
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/wukinugisidokebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/39393282174.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/92875364736.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/zizalewumevudisofate.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9762/files/notekobakidogomepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/sara_meeks_osteoporosis_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/btec_business_level_3_book_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/dajejopuf.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa7.bin
a23da8e72e705acca3770e1be17f24c4936612f1c33daa468e8c5854c15868d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 5224 bytes
font_01_sfnt_off00007c8a.bin
3da28828db8814e8fd2221f7a708ba3a73baeeaf9b860aa2edda20dca18934c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8A 10068 bytes