Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfd9249a9d9a6b4…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 13:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98fc9811995c3268f0d3a9ab6845b006 SHA-1: f18a7d4f37009b996b57385fb5d8ddaa972beb17 SHA-256: 3dfd9249a9d9a6b4e964c773330dd8372691e6f344b5a9000c54687015736ab8
150 Risk Score

Malware Insights

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

The PDF contains a lure for a free Ubuntu ISO download, which is a common tactic for phishing or malware distribution. The document body and heuristics indicate the presence of embedded links, with one specifically identified as a malicious redirector. This redirector, https://ttraff.cc/pify?keyword=ubuntu+15.+04+32+bit+iso+free, likely leads to a malicious payload or phishing page. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=ubuntu+15.+04+32+bit+iso+free
    • http://files.hotelbythepark.com/uploads/1/3/1/3/131381540/liwuxik.pdf
    • http://muriwedu.actrunning.com/uploads/1/3/0/9/130969432/4161908.pdf
    • http://files.wildberrypicnic.com/uploads/1/3/0/7/130739204/5fc3a521ba38d4d.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/64133353253.pdf
    • https://cdn.shopify.com/s/files/1/0455/7815/8245/files/kowogomamarosobup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/adobe_printer_free_download_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/xidalij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/tofaji.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/95233420356.pdf
    • https://cdn.shopify.com/s/files/1/0433/1477/4169/files/85613244924.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/48987613823.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/57325007038.pdf
    • https://cdn.shopify.com/s/files/1/0438/8156/2280/files/book_icon_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/51640750330.pdf
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/4446085567.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_off000077b4.bin
50eb30508efaf1b444e93e438ae4c7f44f5db40f17260ae66da758dd03e26ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 5384 bytes
font_01_sfnt_off00008a2a.bin
f1ed44e0c479195514ac3a7b9cf01bc07a55e601d50eee613cbf82f6394cdfa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2A 10296 bytes

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