Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f08426772bf7ed4…

MALICIOUS

PDF

45.6 KB Created: 2020-09-07 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979f6cb68f40f6dca9226b166fb37c66 SHA-1: faaf0627cb7b860d33c7f54804ec6d3863c7fc7e SHA-256: 7f08426772bf7ed4138361d96188f9878e3c79f56221a4a6f64a91febee660b0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text, though partially garbled, includes keywords like 'Bseb admit card 2019 class 10' which suggests a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic to distribute malicious content.

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.me/wix?keyword=bseb+admit+card+2019+class+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/61814143326.pdf
    • https://cdn.shopify.com/s/files/1/0435/3520/4511/files/contraction_apostrophe_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0466/2683/2549/files/back_to_school_uniforms_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0463/0675/4717/files/frozen_flower_lk21.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/gupususijogivemumip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/diabetes_australia_queensland_fact_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/lipid_structure_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/dularepilal.pdf
    • https://static.usrfiles.com/ugd/c1108c_484f96dcc3024176bdfa54d84957fa36.pdf
    • https://static.usrfiles.com/ugd/7a7fb1_7617a9294a3949a28e77094827d85c3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9464c5a347c4eaf88625084b4a2eb7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf160c16b3a14e759070df4827834312.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006344.bin
73660e85b84f6e74f01cab992fe57d72d539ae6e09ff9ef560d96656221a6813
pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 5756 bytes
font_01_sfnt_off000076bc.bin
2895a2ffddb7c6aa152a0dce18c8fcf30128a39cff3fdf2cf44b520c69640508
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BC 9964 bytes
font_02_sfnt_off00009917.bin
c7c92f2c289dfff34ddb981200d20e9222ca7a5b8caf362978154823ad2ef7d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9917 4328 bytes