Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5d39b9ace8eb43…

MALICIOUS

PDF

49.2 KB Created: 2020-09-04 06:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987372f37c52aacb919972e6da8bc0f4 SHA-1: 0a219e5206315426aee2d1f1eeee66eaf6770c45 SHA-256: cf5d39b9ace8eb4326eea69c198c651d202685a13adaa3f876b838f61e0c9426
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary heuristic firing indicates that one of these links leads to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and a list of other PDF links, suggesting a link farm designed to obscure the true malicious destination. 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.link/pify?keyword=l5r+online+character+sheet
    • https://static.usrfiles.com/ugd/1e8759_66a8b22123344f0a97370e550ebd2598.pdf
    • https://static.usrfiles.com/ugd/735189_b25008e45eb54f9f905a088f377f5105.pdf
    • https://static.usrfiles.com/ugd/3ce946_e62ec17ebfdd4c04a8c67dfc8604d4fe.pdf
    • https://static.usrfiles.com/ugd/22739b_266f57368f464c71b8c0a7b25901b349.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/suzapedujapotagobiboz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4263/3890/files/49455032615.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/kizatizufawagojorexugakos.pdf
    • https://static.usrfiles.com/ugd/041b56_6061ab522c794cbaa629f738e6cd9b77.pdf
    • https://static.usrfiles.com/ugd/493135_d91025c6f881487092de9ef89bcbc494.pdf
    • https://static.usrfiles.com/ugd/0aab01_9e83f5676b9643d89cf37005e508e9d3.pdf
    • https://static.usrfiles.com/ugd/54fa57_788ce1c3b7534ba5880b64cb42aac47e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3542/6970/files/63246912148.pdf
    • https://cdn.shopify.com/s/files/1/0434/3450/8455/files/voot_colors_tv_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/96613182162.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/4363905957.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/56923142281.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_off00007f81.bin
4deca480b6557ea0eb3173c17f90158e62d51b456ae1b557a55d7140e92123d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 4952 bytes
font_01_sfnt_off00009055.bin
a520b05151c6bdcd9fe88b9e36cce31f563c0ae213e9c4228feec31745134eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 11784 bytes

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