Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a83bee84e1d41bc…

MALICIOUS

PDF

51.2 KB Created: 2020-08-29 01:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9d2e9926524844c3e1f4594ba190b2 SHA-1: 1d51975a2570425d4aa9207ad60d393c0dfa48a7 SHA-256: 5a83bee84e1d41bc5406dc694081b626ff27ec2900c31fef4e3c3b3fd4cd255b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document also contains a large number of links to other PDFs hosted on Shopify and static hosting sites, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users.

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.cc/wix?keyword=animorphs+2+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0499/2421/files/27164429602.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/electric_machinery_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/fikavupetoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/selelubikitofinutax.pdf
    • https://cdn.shopify.com/s/files/1/0438/8805/0328/files/iala_guideline_1111.pdf
    • https://static.usrfiles.com/ugd/b8c837_005d6b644292442da998f3d4725c3f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_809096bc45d647aabe6144a7a1001dca.pdf
    • https://static.usrfiles.com/ugd/b8c837_c37b508b33804118a6a1ab87f195e5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a474de23234ad19ff6efe174bdf19a.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cefc3aef284e358fb09f3a1017fe3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3f081d440445e785ead5b9b7aed636.pdf
    • https://static.usrfiles.com/ugd/b8c837_54a8aafbb542419fa5888ecb6c672759.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e1aa1f06bcf4ed6b8c94da83f48776a.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ca.bin
df3cfbfe705d364478b5643e8286e32b57c0a41819df00fa0d167db73f8b3d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CA 5160 bytes
font_01_sfnt_off0000832a.bin
fee89069457cc120e6212fd8843907fd3582ee9608a92a67786c9b354923a840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 10192 bytes
font_02_sfnt_off0000a639.bin
56470cbddfc101ea9faa25da463bb26497f37a3a52a346c08906c6880544a95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA639 17516 bytes

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