Malicious PDF — malware analysis report

Static analysis result for SHA-256 8217bb0fca5d7617…

MALICIOUS

PDF

32.0 KB Created: 2020-09-03 22:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b854375ec5b6f8e8db38c7d6ca22f3a SHA-1: 6025500ea1d9249451eec385df2278e9be7255a5 SHA-256: 8217bb0fca5d76176c98d0115c925b46ca64ea06f8bfa32611c34e2234b1e219
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.club/wix?keyword=central+limit+theorem+lecture+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'central limit theorem lecture pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The primary attack vector appears to be tricking the user into clicking the malicious redirector URL.

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.club/wix?keyword=central+limit+theorem+lecture+pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/angiosperm_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/ocarina_of_time_n64_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0428/4986/1791/files/compac_presario_f_700.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/nokizox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/lajipivufik.pdf
    • https://static.usrfiles.com/ugd/de65f7_8ea74143f4f644359d28373aecc2f33b.pdf
    • https://static.usrfiles.com/ugd/92ee2b_8b540679052d44fcb80ba497fb7b0a0a.pdf
    • https://static.usrfiles.com/ugd/d2751c_f4fb6fe2c5f240eaa598d717a0380aac.pdf
    • https://static.usrfiles.com/ugd/c3f88d_9871dec9a7774b68af32b736ad6a8276.pdf
    • https://static.usrfiles.com/ugd/b8c837_c808b6b09c1e45648afa93b61cb4a8ea.pdf
    • https://static.usrfiles.com/ugd/fac845_da5ea9f45c1c48ddb74c8c0a238cd395.pdf
    • https://static.usrfiles.com/ugd/7aabb2_c5a32bddc8e8479cb52b56039f516749.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_off00004374.bin
a891b344686d86b265afdf5ef2fda6000613787366019ef4b6ba6bcbcc9410e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4374 5124 bytes
font_01_sfnt_off000054b4.bin
29e7bd022d9975bb10bac58bb57a873e6d97fbb0397e621ea6392c24e427d74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B4 9460 bytes

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