Malicious PDF — malware analysis report

Static analysis result for SHA-256 7121557f9128ae5d…

MALICIOUS

PDF

36.6 KB Created: 2020-08-12 22:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce804d0d40cf9c53b922e936809d8ea SHA-1: 6492346f04a155066764320c8bd94e2980400796 SHA-256: 7121557f9128ae5df5418d31b901456bcef8e3602bc1fb8e13e33f0a59dd92c2
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector. This suggests the document is designed to act as a lure, potentially for phishing or malware distribution, by disguising itself as a piano sheet PDF.

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=careless+whisper+piano+sheet+pdf
    • http://files.berghutteskiclub.com/uploads/1/3/1/6/131636655/fe3c7d2260b91.pdf
    • http://files.sherwoodrooster.com/uploads/1/3/1/4/131437563/6693178.pdf
    • http://files.medicalimagingindia.com/uploads/1/3/1/4/131407807/0b56abbd.pdf
    • http://files.sarahgibbardcook.com/uploads/1/3/2/7/132740275/8796329.pdf
    • http://files.dovergreekfestival.com/uploads/1/3/1/1/131163601/vefedifiveposufole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2544/8615/files/immunization_record_ontario.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/the_ayatollah_begs_to_differ.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/sarife.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/35388517113.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/jokeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/mezunibetarezuvujokaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/vosilowutimesazomewurom.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/cleaning_service_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2651/files/39961686318.pdf
    • https://cdn.shopify.com/s/files/1/0431/0823/7473/files/biasing_of_transistor.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6343/files/rewrite_exercises_b1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/silevifufuli.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_off00004abe.bin
2374b7b46ee97821d38aa97ed3d88b65962d6c7682db2ef5c9761f8f812cd5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABE 5128 bytes
font_01_sfnt_off00005c36.bin
c44458c4e7ec7a9fc33e44a1caa801cbe190ee04c8a7dc839ad11fcd3ea85cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 12308 bytes

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