Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d832874fbbc95c…

MALICIOUS

PDF

41.7 KB Created: 2020-09-02 02:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c5aa73a8939d35b0acdced7cb0e469 SHA-1: 916e8e4195fb83d6c08353cdac651fe39445bdbe SHA-256: 31d832874fbbc95cedb2808e13cca8d95ac2abe3ae3f637cfe1b07db4e332c73
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as an 'impossible quiz' answer. The primary malicious URL, https://ttraff.club/wix?keyword=impossible+quiz+2+question+29+answer, is embedded within the document body and flagged by heuristics. The document also contains a large number of links to external PDFs, many hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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.club/wix?keyword=impossible+quiz+2+question+29+answer
    • https://static.usrfiles.com/ugd/89c6ad_c9d5a539db844d2eb734b94eb3d310a5.pdf
    • https://static.usrfiles.com/ugd/cc10e7_1b3f03841dbc4315827132563bc46303.pdf
    • https://static.usrfiles.com/ugd/a07927_28762a4005af4e4292773317f274fb66.pdf
    • https://static.usrfiles.com/ugd/b8c837_f989ae8e67454aa888573520db37d1a6.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/bloodshed_dev_c_5._11_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/raxadofazeruzixojafanibor.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc5f17f1c9a64ac3bf44c0439541038a.pdf
    • https://static.usrfiles.com/ugd/314c35_b966ea4a4d5c4b4fa8795816b6202585.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee278d4c0ec341bb9db7c95ae722fed1.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/rugelow.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/organic_chemistry_loudon_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0447/8844/9437/files/learn_basic_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/nozijivep.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/92548835946.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_off0000641f.bin
2d4ec6ada11351cffd374398c2fe99ed5cd90497e8f37942f385587433cf294c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 5600 bytes
font_01_sfnt_off0000771f.bin
5ad9263c82a06e8f6846db6a67a9ebb9c1038d5a0c6cc41eff658cc73f4310db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771F 10192 bytes

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