Malicious PDF — malware analysis report

Static analysis result for SHA-256 899e4cf5fef56fa8…

MALICIOUS

PDF

52.5 KB Created: 2020-09-05 23:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a419b32638c7f481a16f59d637b4a25 SHA-1: 5aa35e9e389485edda6c126e105b6c85e8022a0d SHA-256: 899e4cf5fef56fa866a9947a147072424648c5cc5a90136373176d9a0f36e359
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.link/wix?keyword=dsssb+ldc+2014+answer+key'. The document body also contains this URL and numerous other PDF links, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is likely intended to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=dsssb+ldc+2014+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/432b07_fd33e02255e04ebe9694f6f77348be3d.pdf
    • https://static.usrfiles.com/ugd/69695d_88f538106f294fee9b0d2f58c624cd1f.pdf
    • https://static.usrfiles.com/ugd/f17c08_9f708c93c77c4ab792a72e0e6f53fb73.pdf
    • https://static.usrfiles.com/ugd/fac845_4d081647be224412b37c28ddf11ce459.pdf
    • https://static.usrfiles.com/ugd/d4c4cf_42b93bef56374deba0ac0b40248b7c17.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5562/files/pixar_intro_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/85146962832.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/31167757584.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/algebra_1_common_core_pearson_textbook.pdf
    • https://static.usrfiles.com/ugd/fe83c3_6a57e3a7d7ee4d96be72502791b8b131.pdf
    • https://static.usrfiles.com/ugd/b8c837_8706d0520cde4725995667a63ef28ff4.pdf
    • https://static.usrfiles.com/ugd/defcb2_324b5a0f0dfc4e73a19c9ad2c35c009d.pdf
    • https://static.usrfiles.com/ugd/e4ee87_321baf7ca06e44799a6e5448fbdccbf7.pdf
    • https://static.usrfiles.com/ugd/d55797_aa307709e4604b2a8c673cb19f38f18a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7ad1b28489c4ecb8a9d12318e518c9b.pdf
    • https://static.usrfiles.com/ugd/03f576_b0e9fd124e2d4767b4345d9438cb3973.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f1f.bin
5cbe66cb8f6234d184212a85f03c3fb3249a528d8b3fecd0fbb6dadf1df28788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1F 5744 bytes
font_01_sfnt_off000082e2.bin
5d88588a87def1254258226defadd4308b5fddd1f0f6ab9af739162442978823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E2 10280 bytes
font_02_sfnt_off0000a632.bin
0379e7c30cdf020f5cdf915448d5c21a55a7b1a8fe45e745fa568a6df8cc0634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA632 9668 bytes

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