Malicious PDF — malware analysis report

Static analysis result for SHA-256 661dafb5a397cacb…

MALICIOUS

PDF

41.2 KB Created: 2020-08-18 16:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c624c2ac5bb2e9dd0a61b78b454d4bd3 SHA-1: 45fec8e1bcc93c271fb7280d5d00005cbbe4cbe0 SHA-256: 661dafb5a397cacb692653c87e415739283b300225f64482c1a9a386b7c56344
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=happier+marshmello+easy+piano+sheet+music'. Another heuristic indicates a PDF link farm, suggesting SEO poisoning tactics. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking PDF links, likely to disguise the malicious intent. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or malicious content delivery attempt.

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=happier+marshmello+easy+piano+sheet+music
    • http://davutil.shsclassof2021.com/uploads/1/3/0/7/130738667/watunizesademer.pdf
    • http://files.mycanaan.org/uploads/1/3/0/8/130813132/9672531.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/gegodonomidutigivejatewus.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/network_international_prospectus.pdf
    • https://cdn.shopify.com/s/files/1/0430/5145/0519/files/nuvijevuzufixup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/descargar_el_alferez_real.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/leresujunapetusiterek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/sewatizadukolesefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/3d_mohr_s_circle.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/gradient_border_css.pdf
    • https://cdn.shopify.com/s/files/1/0440/7292/7384/files/board_directors_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/58059929652.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/33010614988.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_off000058a8.bin
8eba7f98c28d3c612cfc62f4b43ec5ebce50016668633162307f7d2436d21cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A8 5236 bytes
font_01_sfnt_off00006a50.bin
e7f84b583f68a34f6d1924d9bbbe84e67a207c4a7cbb1c01e87cd3ac1ed4bdcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A50 14360 bytes

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