Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb03115ff2dfa77…

MALICIOUS

PDF

52.8 KB Created: 2020-07-10 17:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ca9c1d8cf27f1efed81560c1618d2c SHA-1: 342186cd884f908386dba5b7dcbbaabef94a89a8 SHA-256: cbb03115ff2dfa77cb0bae3951ea7af3cae08241d7e33a884f0697f6ee7685d0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects through 'ttraff.cc', a known malicious redirector. The document body, though partially garbled, includes the text 'Arrl band plan chart pdf' and the malicious URL, suggesting a lure to trick users into clicking the links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.cc/pify?keyword=arrl+band+plan+chart+pdf
    • http://files.acechr.ca/uploads/1/3/1/4/131437981/1409618.pdf
    • http://files.rathfrilandmotorclub.co.uk/uploads/1/3/2/3/132302913/zomawuzivoludi_petusol_mufawukemur_xitedelufukojob.pdf
    • http://files.adorable-amber.com/uploads/1/3/0/8/130814605/6776960.pdf
    • http://files.lynnebarrett.com/uploads/1/3/2/6/132695874/6711400.pdf
    • http://files.ezekiel37ministries.org/uploads/1/3/0/9/130969485/b8099cc.pdf
    • http://files.stonesphilly.com/uploads/1/3/1/3/131398022/sikezimilonu-puxalibabeba-nowodog-zivifewixupapa.pdf
    • http://files.thechurchplanter.com/uploads/1/3/1/0/131070204/5623333.pdf
    • http://files.release-the-pain.com/uploads/1/3/1/1/131164231/4008060.pdf
    • http://files.brandimcpeak.com/uploads/1/3/0/7/130738753/0d3cf.pdf
    • http://files.tereficacademy.com/uploads/1/3/1/8/131856293/roxulabit.pdf
    • https://wixaxerupaf.files.wordpress.com/2020/07/91415914701.pdf
    • https://kemekakusava.files.wordpress.com/2020/06/fuzuf.pdf
    • https://ginirosidu.files.wordpress.com/2020/06/fogasobupe.pdf
    • https://tesagimin.files.wordpress.com/2020/06/pofubuxojozidex.pdf
    • https://milerupefimu.files.wordpress.com/2020/06/20977552007.pdf
    • https://tupozubobusi.files.wordpress.com/2020/06/nopegalege.pdf
    • https://nujogola.files.wordpress.com/2020/06/74868943545.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21617342462.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008419.bin
61ab2e89c22da234668b66c7ac23bdedbea9ff6786f4f006b5c91eb56b59cffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 4708 bytes
font_01_sfnt_off000093f5.bin
65c4887cd3138700d43fe5a43dd1c7107dcc4703718f72f111147a9ebbda8b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F5 15408 bytes

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