Malicious PDF — malware analysis report

Static analysis result for SHA-256 004934c33b3d92ae…

MALICIOUS

PDF

44.4 KB Created: 2020-08-24 01:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7677b28a2787b104272a42fc17a5cf SHA-1: b2fa98e7a105561ad53fb2c021eb5088c62e7be9 SHA-256: 004934c33b3d92aeee9063314ee49da53792662ed23f4951d28f4435307f9fb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for sheet music. This URL redirects to `https://ttraff.cc/pify?keyword=banana+boat+song+trumpet+sheet+music`, which is a critical IOC. The PDF also contains a large number of external links, many pointing to Shopify domains, suggesting a link farm for SEO poisoning or to host further 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=banana+boat+song+trumpet+sheet+music
    • http://files.realabstractart.com/uploads/1/3/0/7/130740141/08f5737075.pdf
    • http://files.krwoodworkings.com/uploads/1/3/0/7/130738554/8946805.pdf
    • http://files.unveiled-ministries.org/uploads/1/3/1/4/131407102/7732875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/antifouling_convention.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/kugavanej.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/richard_bandler_libri.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1525/files/california_dreamin_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/48429889234.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/pufudafadoburisotaxipem.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/vorum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/ap_module_grade_9_teacher_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/ptolemy_almagest.pdf
    • https://cdn.shopify.com/s/files/1/0450/2913/0404/files/gotubopi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/rugenetizejipifanezuweri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005283.bin
35636eb7646ca9f404110040ad655e20e87a93920e17ecca9e7ed4adcc2bbbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5283 5388 bytes
font_01_sfnt_off000064a0.bin
e6dc63df2d30f0970032513bcec8c98e59c2ab0bbd972dff183a68e39bdf3285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A0 15036 bytes
font_02_sfnt_off000093c6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C6 4324 bytes

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