Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c6d59318b12d61…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 11:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a777734cf86b5512ec079ef08ea23aa1 SHA-1: fdceb3bb43a90d7d3df97b23995ed81187db044f SHA-256: d4c6d59318b12d6175c7826d664296bd43095bb9181e5b51ede6a08f95fa62f3
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The primary malicious URL identified is 'https://ttraff.cc/wix?keyword=ejercicios+resueltos+vectores+1+bach'. While the document body contains garbled text, the presence of numerous links, including one to a known redirector, strongly suggests a malicious intent related to link farming or redirection.

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/wix?keyword=ejercicios+resueltos+vectores+1+bach
    • https://static.usrfiles.com/ugd/9734e7_2790a85a4762476f9c3ea48596d2cd3e.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ccdedb72053c465a89166a0c74b5db65.pdf
    • https://static.usrfiles.com/ugd/db1da1_7d318380636b4bc6a61752eeed39d47e.pdf
    • https://static.usrfiles.com/ugd/89064d_43188c712cd8459292e0fa304777984c.pdf
    • https://static.usrfiles.com/ugd/a1fb72_cf454499ab534f45896fe57b7aedca35.pdf
    • https://static.usrfiles.com/ugd/aff7ca_9a7c07742c494dfaa3a313b32f3f6b10.pdf
    • https://static.usrfiles.com/ugd/49be48_0279d552dcfd4eaab95af0273590404f.pdf
    • https://static.usrfiles.com/ugd/d55797_aa307709e4604b2a8c673cb19f38f18a.pdf
    • https://static.usrfiles.com/ugd/6908d7_15169a882a154591b2d51829b4496def.pdf
    • https://static.usrfiles.com/ugd/253000_34b7fbf1b4ac4f25887d804ea329adab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a90.bin
3e7a97638de708e0e312bb1c58748ca97b9d7901c497ca456ac5f6b1446508ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A90 5172 bytes
font_01_sfnt_off00006c2e.bin
f85f718805a3dfc567eccdc1cffa005f809d899e9045b03ba91bd2859f7b669f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 11464 bytes
font_02_sfnt_off00009192.bin
5ec08b49353f1a3b359f6d3a2da6678d255748991fc6cc591e176548fa886f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9192 16068 bytes

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