Malicious PDF — malware analysis report

Static analysis result for SHA-256 d148bafb6ce6016e…

MALICIOUS

PDF

44.4 KB Created: 2020-10-26 05:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff768cf255ed985f73c0d1cb75255f62 SHA-1: 1429ce6e3613179bd4e5a149db8904c9fac2a106 SHA-256: d148bafb6ce6016ea32d5df9e4dd2d813a816e142fd8053f7a340d7b89396ac5
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack vector appears to be luring the user to click the malicious link, likely leading to a further stage of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/123?keyword=free+printable+math+worksheets+for+year+1
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8b44c25daf0.pdf
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f899469aadd9.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f9594de812cf.pdf
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8724fc843f5.pdf
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f89150294191.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8bccf6aec55.pdf
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f894e58abdaa.pdf
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5f8fdaaea72e1.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8824ee5747a.pdf
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f915aaa256b3.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f8e763324d88.pdf
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f9019932ecc1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kavitokolezub/29168913063.pdf
    • https://s3.amazonaws.com/wulagisi/cinnamon_girl_guitar_tab.pdf
    • https://s3.amazonaws.com/xebuvuwov/burlington_coat_factory_job_application.pdf
    • https://s3.amazonaws.com/tejuvonixag/chernobyl_nuclear_accident.pdf
    • https://s3.amazonaws.com/pezofut/57981495269.pdf
    • https://s3.amazonaws.com/domegagowevag/bsc_1st_year_maths_book_download_2017.pdf
    • https://s3.amazonaws.com/jamokaroxoj/anatomy_of_digestive_tract.pdf
    • https://s3.amazonaws.com/sigobija/insert_bitmap_image_into.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_off00006d77.bin
9f49209e09b3bb8227d860aac5c9988c0d7085c706f16e9b1522960e3302c531
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D77 5544 bytes
font_01_sfnt_off0000803b.bin
ad83a31ffebc3b7bb9eaf520e550a80986dece75d3f5d68e26cafe5b23f3bed1
pdf-font-stream PDF embedded font (sfnt) at offset 0x803B 10460 bytes