Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b155c385e3d1366…

MALICIOUS

PDF

38.3 KB Created: 2020-08-23 09:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a309d703eb948a0bbb7edd87d8ad10a7 SHA-1: 89788d21433d99128918c3ff59220af17f70e02c SHA-256: 9b155c385e3d1366e24e2353e807a8ee8745ad1011504b6babf3bfa08c0d6f6e
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a link to piano sheet music. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking and visibility. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs indicate a redirection attempt to malicious infrastructure.

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.
  • 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.
  • 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.com/pify?keyword=ballade+pour+adeline+piano+noten+pdf
    • http://bojuwi.texairamerica.com/uploads/1/3/1/1/131163635/danisomonobafu-wajovasavab.pdf
    • http://files.perfectlyimperfectcollegian.com/uploads/1/3/0/7/130739780/741ee4126c70ce4.pdf
    • http://luzuj.liffordhealthcentre.com/uploads/1/3/2/7/132710712/zepaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/juvuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/mupam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0491/9971/files/arunagirinathar_thirupugal.pdf
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/25278593734.pdf
    • https://cdn.shopify.com/s/files/1/0437/1477/3141/files/41965156621.pdf
    • https://cdn.shopify.com/s/files/1/0432/8384/1190/files/watercolor_tricks_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/samujuw.pdf
    • https://cdn.shopify.com/s/files/1/0444/4153/4631/files/ruvatemulalumegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/geruxixesafajedav.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3814/files/tenok.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_off0000480e.bin
3dbc05451b3cb2878573498b98ca1f7b13397376bf6c5f9871e6715f5210ac27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480E 4788 bytes
font_01_sfnt_off0000585a.bin
0bc013c42446fd95a33a2fabe450660a713773d3b2f5cc1d9488d5e245bd5239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585A 11488 bytes
font_02_sfnt_off00007cc0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 4324 bytes

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