Malicious PDF — malware analysis report

Static analysis result for SHA-256 8380ee6c26191b8d…

MALICIOUS

PDF

46.4 KB Created: 2020-08-23 23:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a47f490cfa6582c1ae265c36fb16ec SHA-1: 6f62343c18c21e2373f6d99bc309a96f53a0dc51 SHA-256: 8380ee6c26191b8d83a38510c8d4a9e782d753887099b1694fcef1ea5883d7bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'marigold english book class 2 answers', suggesting a lure to disguise the malicious links as educational resources. The presence of a link farm and a high ML classifier score further indicate malicious intent.

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://ttraff.cc/pify?keyword=marigold+english+book+class+2+answers
    • http://mobaxupi.cadychiropractic.com/uploads/1/3/1/0/131070450/kexunajopeto.pdf
    • http://files.arkangelcreations.net/uploads/1/3/1/4/131452903/vezemavot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/1629/8393/files/cuet_admission_result_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/piridunififajulula.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/88604486887.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/wepexitorosif.pdf
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/critical_theory_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/ninebunuxagavijoje.pdf
    • https://cdn.shopify.com/s/files/1/0460/0512/5281/files/android_auto_application_mode.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/air_force_question_paper_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/62256829157.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/29854333635.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/ayatul_kursi_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/37940091712.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/un_sustainable_development_goals_progress_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000629e.bin
107a66c7342b16d52e03b3c64ba4a91531e907fa8189837632277b55b7038297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 5636 bytes
font_01_sfnt_off000075d0.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D0 1800 bytes
font_02_sfnt_off00007e5d.bin
f7fcb6053de1d9dc7e70117a9ad13b7c53c5b51f8b903e66be70bc468ec6862c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5D 9724 bytes
font_03_sfnt_off00009fe7.bin
55086fd9ee3a40967ccb26436e4e17c00c087b1f5e27f1daed9b17afabfead88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FE7 2916 bytes

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