Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eb8ff666f3689f…

MALICIOUS

PDF

46.7 KB Created: 2020-08-02 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772de2a0c80d561767e718c1707e3cf2 SHA-1: e07e21f2013c5bdaa40de5a9514864dea8010ec0 SHA-256: 17eb8ff666f3689f8d632526c5017dbbc04540b3739c8c1a18243a83c1d3a5a4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or distribution mechanism. While no scripts were extracted, the presence of malicious redirectors and numerous external links points to a campaign likely involving spearphishing attachments to distribute further 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.ru/pify?keyword=%25D0%25B4%25D0%25B0%25D0%25BD+%25D0%25B1%25D0%25B0%25D0%25BB%25D0%25B0%25D0%25BD+%25D0%25BF%25D0%25B5%25D1%2581%25D0%25BD%25D0%25B8
    • http://files.kitbernal.com/uploads/1/3/2/6/132681303/goduteden_waziwotebako_fumona_fifibijifobab.pdf
    • http://files.katyasadoff.com/uploads/1/3/1/6/131606694/lolokidinalato.pdf
    • http://files.kaukauproductions.com/uploads/1/3/1/8/131871627/1382389.pdf
    • http://files.heritagefarmsrescue.com/uploads/1/3/2/7/132740778/0114e232fa7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/rifop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/65882858126.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/47335658670.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/75840208051.pdf
    • https://cdn.shopify.com/s/files/1/0433/3581/1231/files/1236419819.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/40706002412.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/zevodemefepisediw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/potulebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/bilexizobenowubexudov.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_off000067fb.bin
f52b0371c601059ff10d00bc59eb798f09957cec321321fa94f1b778aa7ac97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 5056 bytes
font_01_sfnt_off00007900.bin
90f5893d38504dea210e5a4768a9f5eda144eda17f00499d508ccc50bcb8999a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7900 16636 bytes

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