Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c76e9404f09c79…

MALICIOUS

PDF

78.4 KB Created: 2020-08-31 09:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77db9370c01d8b24e5ac4d21d55102b2 SHA-1: 023d48f60ed87a7f7fc41833184df384959b5b87 SHA-256: 05c76e9404f09c79738b936272e9b20bd5630e33b27fd9eeea68a491932cb07d
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://ttraff.ru/wix?keyword=grammar+for+fce+editorial+cambridge'. This URL is embedded within the document body, suggesting a phishing or scam attempt. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content. No scripts were extracted, but the malicious URL is the primary indicator of compromise.

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.ru/wix?keyword=grammar+for+fce+editorial+cambridge
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/756799_0d38dc725a494854b386bf012d6f21f3.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_efd3c0482c1140ae94fd55f0388fb414.pdf
    • https://static.usrfiles.com/ugd/90c678_4401b0f87ebd4eeda09ebe7f825bfaac.pdf
    • https://static.usrfiles.com/ugd/b8c837_808ed6bc52454164bcfb3ea2763fa2b2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/julsnger_av_taylor_swift.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2582/files/kikufalovogunonarij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/zisevuvetutenodikopipula.pdf
    • https://cdn.shopify.com/s/files/1/0448/2210/2173/files/business_vocabulary_in_use_intermediate_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/wufatadajewigovavazoreke.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/wordly_wise_3000_book_7_lesson_12_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/vezebutagapotadofivubo.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/pokemon_silver_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/random_string_generator_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0458/2368/8867/files/41625669239.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/tetarej.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_off0000dfe0.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 2828 bytes
font_01_sfnt_off0000e9da.bin
089dc80f887ac5f61ee0e86db10d6d5c7fe7ff1049228446f895bf3a1a6dbc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 5016 bytes
font_02_sfnt_off0000faee.bin
3d0441b8c9af12c2d74a60e5fc24dd917f6fbd48e3795e1629699e661b02c33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 10372 bytes
font_03_sfnt_off00011dd5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 4324 bytes

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