Malicious PDF — malware analysis report

Static analysis result for SHA-256 f554974ae642c55a…

MALICIOUS

PDF

36.3 KB Created: 2020-08-04 07:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a01cefa3343e927e83c3dc589310ec8f SHA-1: 006290c9eb210c85639cf164806c6dc3123170f7 SHA-256: f554974ae642c55ad251f70fbf0fd48a616cd3213b10293ddb9fe712f04a7790
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a textbook and the malicious URL. The primary attack vector appears to be luring the user to click the malicious URL, which is disguised as a link to a PDF. The ML classifier strongly supports the malicious nature of this PDF.

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=fundamentals+of+general+organic+and+biological+chemistry+4th+edition+pdf
    • http://files.stoneycreektamaskan.com/uploads/1/3/1/4/131452735/pujunuduni.pdf
    • http://xebufejat.cafeoflifekalispell.com/uploads/1/3/1/4/131407901/8219914.pdf
    • http://files.kavorka-racing.com/uploads/1/3/0/8/130813417/jekilejujel_wevulotaze.pdf
    • http://files.tnhillsaussies.com/uploads/1/3/1/0/131070971/1991089.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/muxuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2240/files/fagenitedizem.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/11588092452.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/30099292563.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/sosekisepupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5462/9015/files/81472524635.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/89921680380.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/2004_polaris_sportsman_700_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2397/files/22416800344.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5749/files/63032184351.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/94265339813.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/42924346859.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_off00004f4f.bin
45320e79aa6d2231d34ec0519b59eb9de5c56f53b0c60f1d5fd723e26f853838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4F 5856 bytes
font_01_sfnt_off00006320.bin
fdc32f6936d796e568b701b4369e9da47f14529a4af6b2f8ad226d99e99617cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 9508 bytes

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