Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b91070ecc58df8…

MALICIOUS

PDF

49.9 KB Created: 2020-08-30 06:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 675cf8d773915037329f9eb228045845 SHA-1: b12f8685b8eb288d3c5aeaff168bf47617f8936a SHA-256: 63b91070ecc58df89ec8f426406bc47f28764cc7809dd40e0c0543f31c585515
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The embedded URL 'https://ttraff.ru/wix?keyword=quest%25C3%25B5es+iluminismo+8o+ano' is the primary indicator of malicious intent. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents, suggesting an attempt to distribute or host malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=quest%25C3%25B5es+iluminismo+8o+ano
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_6269df8c38474704b9020af4bb0b4d61.pdf
    • https://static.usrfiles.com/ugd/2e16aa_000bb195df1f437ba85e9e35c37fa7f2.pdf
    • https://static.usrfiles.com/ugd/6da380_80d61e4924a74f39817fceab3998ce94.pdf
    • https://static.usrfiles.com/ugd/12f4eb_e8a5f774580b4adcb62dee12aec539b1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/51942133749.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/vinugeju.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/todojowuvawajuzagi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/33659202426.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/namonal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/bonuzafobilugosi.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_off00007386.bin
fafb42093b692d780f44d87bb9b2aacf01b1d9e8dd9f7be91bbf4aab87289a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 5088 bytes
font_01_sfnt_off00008471.bin
8822fcac3a7858aa0758299a66c645dc3bbb01c713dc1c112d83c0aec76161a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 13056 bytes
font_02_sfnt_off0000aad7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD7 4324 bytes