Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0ea8cb5f1bcf2b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 08:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b1702cbc3a007b1369a968b6c958ad SHA-1: c55d9eecece0272b5a74436cd76d116e06765847 SHA-256: 9c0ea8cb5f1bcf2bf11beb58416fdd15f8b7174373e264c66e3b8ae1b49cfc51
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a redirector to a malicious URL, disguised with keywords related to sheet music. The ML classifier strongly indicated maliciousness. The primary malicious URL is https://ttraff.cc/pify?keyword=air+on+a+g+string+piano+sheet+music+pdf, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and contains embedded URLs that point to a link farm hosted on Shopify, with some of these links leading to potentially malicious content.

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=air+on+a+g+string+piano+sheet+music+pdf
    • http://dakizo.ncbbq4u.com/uploads/1/3/1/8/131857334/f75d551.pdf
    • http://files.eatplaywed.com/uploads/1/3/0/8/130813818/jojanida_sopaxavakar_derenevumu_fasugo.pdf
    • http://files.karinalunatk.com/uploads/1/3/2/6/132681836/773118.pdf
    • https://cdn.shopify.com/s/files/1/0429/2624/3996/files/alphabet_tracing_worksheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/rudri_path.pdf
    • https://cdn.shopify.com/s/files/1/0440/1725/4558/files/39614573963.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/36762604686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamawogedeveredu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/ritegodiwelefazowud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/nokulojuvunaroreko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/40130060101.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/how_to_stream_on_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0439/8897/5774/files/46668008821.pdf
    • https://cdn.shopify.com/s/files/1/0438/3031/3122/files/60730134301.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_off000052b7.bin
b6935e45439813018a683793095e07ab188a41b431bb9c3440690fac3bfabd13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B7 4552 bytes
font_01_sfnt_off000062ed.bin
e5cf62953a9e6eed0350ab9742964c7008039b9ed9bdd66bbd30c2f4194f734d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 5528 bytes
font_02_sfnt_off00007590.bin
90a3e88a7cea037c1feccc25986f2939b7f7e8c43df2d3a7ad9549a1dc5b8a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 10256 bytes

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