Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cce75263aaf6199…

MALICIOUS

PDF

46.2 KB Created: 2020-08-08 20:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: decbf353a82f3718825c9ff6278ed072 SHA-1: 63569a02cd8f41a12582998f8f8ca7617a54d44b SHA-256: 8cce75263aaf6199d9570c3186d0ffe0b29df0867ea185d5a714af32b97ec637
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cathode+ray+oscilloscope+pdf+notes'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other Shopify links, suggesting a lure to a malicious site.

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=cathode+ray+oscilloscope+pdf+notes
    • http://files.giuliosterbinisounddesign.com/uploads/1/3/1/1/131163976/4ba221.pdf
    • http://rujef.forestchild.co.uk/uploads/1/3/2/7/132710621/2502416.pdf
    • http://files.amargmedia.com/uploads/1/3/2/6/132681308/sakoxofopefi.pdf
    • http://files.createdigitalpublishing.com/uploads/1/3/2/6/132695472/soluwanutakeg_nonaget.pdf
    • https://cdn.shopify.com/s/files/1/0436/4559/9904/files/23287529897.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/28041446479.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/18649154183.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1268/files/rasoretim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/filunovum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/zukigot.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/la_evolucion_de_calpurnia_tate_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/petekowatedaserevinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/addition_word_problems_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/2505/6412/files/convert_to_word_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/33893059252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006955.bin
1b1a24c7027e6143b0dc3d27e580a3ca54e5580907306937746c629c8bed5299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 5156 bytes
font_01_sfnt_off00007ae2.bin
0d22a8531a4d573e46d63ff0b34e1508db9030ac156cf563e1b06b88a3af0a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE2 10264 bytes
font_02_sfnt_off00009dfd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFD 4324 bytes

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