Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d1d9fa90a9bbd0…

MALICIOUS

PDF

51.0 KB Created: 2020-10-03 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7f4dc52ca5a2ced2732c7fcaac338d9 SHA-1: 6268c8fed06c0779ea37236d88200390e67a01d9 SHA-256: 24d1d9fa90a9bbd023c30e63153cca45bbd4ffd2af3b472b8c3a391a517d09f6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=doki+doki+literature+club+base64'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign Shopify links but likely serve to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to lure the user to a malicious site.

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://cctraff.ru/strik?keyword=doki+doki+literature+club+base64 In PDF document text
    • http://files.donnahoustonafca.com/uploads/1/3/1/8/131856907/8740838.pdfIn PDF document text
    • http://files.creativerecyclingworks.com/uploads/1/3/0/7/130776755/ponapisik.pdfIn PDF document text
    • http://files.radiopigs.us/uploads/1/3/1/4/131453498/najageferodinet.pdfIn PDF document text
    • http://files.austintexasfamilyhistorycenter.com/uploads/1/3/1/4/131437487/8a41b9bc35aafbb.pdfIn PDF document text
    • http://sonazoge.grinterfriends.com/uploads/1/3/0/7/130776763/7147706.pdfIn PDF document text
    • http://files.thesciencezone.org/uploads/1/3/1/4/131453182/4534189.pdfIn PDF document text
    • http://pazix.thefruitfulfox.com/uploads/1/3/2/6/132681670/noxez-ragufo-vekabu.pdfIn PDF document text
    • http://xukota.thejordanhomestead.com/uploads/1/3/0/9/130969354/disitologiwebanoted.pdfIn PDF document text
    • http://watal.newenglandbusinesscenter.com/uploads/1/3/0/7/130775470/vaxom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4417/0649/files/11903106448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4039/3384/files/59292994791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/block_puzzle_cheats_exceptional_500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4891/9455/files/jazinofikeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1608/9510/files/43245388355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3294/8129/files/leetgram_apk_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3965/7631/files/26614281690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7631/1447/files/carta_responsiva_de_automovil_ejemplo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0449/2438/files/sdsu_library_printing_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7734/7744/files/xutarosawijulalone.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8897 5380 bytes
SHA-256: 9b5a6ca8f97a5d5307ec1991fb314fd22a791a57cedc6cb4417501ed190bc1bd
font_01_sfnt_off00009af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF5 10504 bytes
SHA-256: cf1093b23a22ddac2b8d53a04a94fd93092cd2e65d8d5cbb856a4f5d7b9d8f1a

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