Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a88a20a8dfe0a1…

MALICIOUS

PDF

48.5 KB Created: 2020-08-31 01:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b66bf4099d381ac2dcaa37f7465ac69 SHA-1: cb4e5c0e22717c8648bb79652d327062274e9d76 SHA-256: 59a88a20a8dfe0a1f2776c322ac5ab72aa625e374fa9f411255c4609e6f7457e
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=rehabilitative+frame+of+reference+for+occupational+therapy, which is identified as a malicious redirector. The presence of numerous embedded links, including one pointing to a Shopify domain, suggests an attempt to lure users to external, potentially malicious, content.

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/wix?keyword=rehabilitative+frame+of+reference+for+occupational+therapy
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/80307828622.pdf
    • https://cdn.shopify.com/s/files/1/0432/3442/7047/files/sigezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1328/3735/files/learn_calligraphy_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/sisowapilug.pdf
    • https://static.usrfiles.com/ugd/bf650e_664765d4f2bb4c049d7150a380f0b0c3.pdf
    • https://static.usrfiles.com/ugd/565485_12834f48810540da91e7f7daa21fa96b.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_4cfa3f1f440448318b0e1a48a854f94d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dc361af2a83430a8539f059207bd5e6.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/malayalam_alphabets_writing_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0469/0558/9920/files/bazunudabizolej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/xedineba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/93539330645.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/23461286793.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/32071461166.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/kinid.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_off00007ff6.bin
36625c7d2665a88e384d2d481a5abbdf4e17a20323992aabaf329cef329c0a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 5384 bytes
font_01_sfnt_off00009230.bin
a5ffe929f4e6d3cfdec692b6aed607190f97784333c10592fc7bcee1d122a93f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9230 10160 bytes

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