Malicious PDF — malware analysis report

Static analysis result for SHA-256 77720e9e43c5b401…

MALICIOUS

PDF

47.7 KB Created: 2020-08-07 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca949bcc943c8f7d36f1e8f389dc27de SHA-1: a8189e905d12b9ccbfa64cab8730bf51cdc1f10e SHA-256: 77720e9e43c5b40131019e32b6b67d1de961fbbf6e0447311e96dbb52f903c8b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=acute+pulmonary+oedema+pathophysiology+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to drive traffic to malicious infrastructure. The presence of many links to external PDFs, some hosted on potentially compromised or low-reputation domains, further supports this attack pattern.

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/pify?keyword=acute+pulmonary+oedema+pathophysiology+pdf
    • http://files.frommairpad.com/uploads/1/3/0/9/130969966/wurewe_banonirevibu_jojajivi.pdf
    • http://files.wolfisle.com.au/uploads/1/3/1/4/131407406/23dccc4e5.pdf
    • http://files.stadiumcrashers.com/uploads/1/3/1/6/131606758/902fac9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/96546729316.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/russian_grammar_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/tezupananagebobowepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/fokekuxul.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/fumisazutulinugodad.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/active_directory_interview_questions_and_answers_l3.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/fajawogogijubedage.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/97373294266.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/5404153390.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/50775663643.pdf
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/sullivan_college_algebra_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/24155119792.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_off00007deb.bin
66a3590d236ff43bfcedd61a537fcdd7088d1575c4800c8ab29321611328f35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 5660 bytes
font_01_sfnt_off00009112.bin
ad0e5cef62d752aba4c4708cc11f13b24034773e6bf1112930162dc9893d4cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9112 9508 bytes

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