Malicious PDF — malware analysis report

Static analysis result for SHA-256 122233f4b60bac07…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 12:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e722a1189f5af4dd982ceab368df6b5c SHA-1: e54e209af5c947fd727a9ca73b2873310c7f90a5 SHA-256: 122233f4b60bac07b5312a10dc53ec8f89f937447f3c11f46efc0d007f88a3ec
234 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to redirectors and a link farm. The document body explicitly contains a URL that is also listed as a malicious redirector. The presence of embedded URLs and the ML classifier output strongly suggest this PDF is designed to lead the user to malicious content, likely for a phishing or malware download attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ttraff.com/wb?keyword=how%20to%20extract%20pages%20from%20a%20password%20protected%20pdf
    • http://files.conyersschoolofballet.net/uploads/1/3/2/6/132682851/satevosijavaxega.pdf
    • http://files.thewhitefamilyreunionisaiahcarrie.com/uploads/1/3/0/7/130739505/62a42c8d3a0b4bc.pdf
    • http://files.riversideministries.com/uploads/1/3/1/4/131453982/tukobi.pdf
    • http://files.2030portal.com/uploads/1/3/1/4/131438784/pixosefireni.pdf
    • http://files.kylerwilcock.com/uploads/1/3/0/7/130738960/4991967.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/tazojetojirarinip.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/nutrient_agar_media_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/12811645696.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/zagufekorob.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/josopodegomewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/61020927257.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/information_technology_project_management_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/5973/0839/files/80716235468.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/gosobigupemaxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdf
    • https://cdn.shopify.com/s/files/1/0431/1652/7770/files/vukerij.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061fb.bin
0d36266e32ee1652c5105b63e21094326eca4ff5c9f6ac4a36691f817c20c7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FB 5564 bytes
font_01_sfnt_off000074e7.bin
cf82104af56845a9cf75139eee030b70b9a560c55e8c754149b8ba14ad267d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 9908 bytes

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