Malicious PDF — malware analysis report

Static analysis result for SHA-256 33157e8e0828b78c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 13:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba8e62abebeca2b7ea477a823a7a4c2f SHA-1: 52a71c3ba57327a4fbb7f3279532793de2317af0 SHA-256: 33157e8e0828b78c3cacc8e7aac89ec546bb51d7feaaba78e226d02cea70751c
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.ru/wix?keyword=graveyard+keeper+la+tinta+y+la_pluma'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious URL and several other Shopify URLs, suggesting a lure to external content.

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.ru/wix?keyword=graveyard+keeper+la+tinta+y+la+pluma
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/39423952014.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/68630639516.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/star_wars_battlefront_2_2005_free_do.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/12_note_kalimba_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9376/1956/files/miseria_y_grandeza_del_partido_comun.pdf
    • https://cdn.shopify.com/s/files/1/0434/4263/4917/files/singer_500a_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/coursera_r_programming_quiz_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/nepuvadifanafogibivu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2534/1343/files/riesgos_biologicos_laborales.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/divina_commedia_con_note.pdf
    • https://cdn.shopify.com/s/files/1/0430/4971/3817/files/tagax.pdf
    • https://cdn.shopify.com/s/files/1/0450/1169/7814/files/technical_interview_questions_and_answers_for_desktop_support_engineer.pdf
    • https://static.usrfiles.com/ugd/b8c837_9becf97edb5b47ac802ddac25e54f8ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd79669ea32441c2a7b886e7b9b0e282.pdf
    • https://static.usrfiles.com/ugd/b8c837_890edbcfbb974a88b5e690fcd385f8fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_eede3ab716d54fe9b473468c1b025f2a.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_off0000666f.bin
e036143c8f5c94d832dd71f055d996c0c052345e29a91c291c7660b31a1b99b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 5184 bytes
font_01_sfnt_off00007816.bin
422a1cafab4471cc548a3e67b8f22dd3c09067d45158bc83068dd04d7f8a0c50
pdf-font-stream PDF embedded font (sfnt) at offset 0x7816 10152 bytes