Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bff4250b0f582f2…

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d947e561fcf6c12cf5c878cf139e953e SHA-1: 1b6ff5a7e78ba74c2986ccd7c5827cc0b69dfa75 SHA-256: 5bff4250b0f582f27dab2b677dd8a5ec15d7166ac4f280b8beb4bd28f0a98a93
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent URL, 'https://ttraff.com/wix?keyword=class+11th+botany+notes+pdf', is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic to malicious infrastructure under the guise of providing educational content.

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.com/wix?keyword=class+11th+botany+notes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ce5d00_b76c2d841044429fb8ce535d4b1af077.pdf
    • https://static.usrfiles.com/ugd/a91264_4c3bf923d4c14f0ba3a8d51d8ef61837.pdf
    • https://static.usrfiles.com/ugd/2074c9_477e311dfbe84ba88d9389b0a0dd6c51.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/gujarat_university_bcom_sem_2_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/25973827037.pdf
    • https://static.usrfiles.com/ugd/b8c837_f597cbd6716a4d549b8655d98ca9ebd9.pdf
    • https://static.usrfiles.com/ugd/79cb75_d41e19a4d5a541f3a4785fd68ab1dca2.pdf
    • https://static.usrfiles.com/ugd/efb3f0_1e230151bbdd4982a94502b5c183b096.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/automobile_bill_of_sale_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/dirasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/gastrocnemius_strain_rehab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000701a.bin
1379e3de771a092b6a1e29b5086c6a5026e361cd49c884361cf2ca5ccc83c937
pdf-font-stream PDF embedded font (sfnt) at offset 0x701A 5232 bytes
font_01_sfnt_off000081e8.bin
76d61d9957c8790e2db9ca474abd3bf6653381a14e7e78db758638ef2fa97692
pdf-font-stream PDF embedded font (sfnt) at offset 0x81E8 10736 bytes