Malicious PDF — malware analysis report

Static analysis result for SHA-256 6821599d7383efaf…

MALICIOUS

PDF

45.4 KB Created: 2020-08-11 13:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf252a47ba44dd645d8e1faccd8337a SHA-1: b5ffa749818f3c9e2b4e89a8b28f7c51456c4f55 SHA-256: 6821599d7383efaf8480b13201e2cb410ec7d71dd9b9be93339da5f8405658ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious with high confidence. The document body contains text related to 'Stp water treatment process pdf' and the wkhtmltopdf application, suggesting a lure document. The primary IOC is the malicious redirector URL, which is likely used to lead 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.cc/wb?keyword=stp%20water%20treatment%20process%20pdf
    • http://files.suezn.com/uploads/1/3/1/4/131406535/8028fb09c905.pdf
    • http://nutur.allsaintssjvcomputerlab.com/uploads/1/3/0/8/130874254/c74c34211b8565c.pdf
    • http://nunugubiz.grizzlybeatz.com/uploads/1/3/2/6/132681647/162dfa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/5037878211.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/quran_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/21072752757.pdf
    • https://cdn.shopify.com/s/files/1/0429/1205/5463/files/56420914036.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/zetokigakefuzebadaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4131/5223/files/73137447058.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/bovegasawapexageliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/ncert_chemistry_class_11_atomic_structure.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/xixeginewadivomawavimeg.pdf
    • https://cdn.shopify.com/s/files/1/0441/3951/1960/files/29235233475.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/36445956360.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/xupeposesoxutidulu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/wizolotisoxenuragosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/20522950603.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_off00007301.bin
a51042b3b0f848a8a9922254fa6da3fc7074200d588e7d9edd23d07d9114d7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7301 5464 bytes
font_01_sfnt_off0000858c.bin
51b27569fb8107c21c60ad881412f447288b51307f13e1815e7ddf68bd2dfa65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858C 10228 bytes

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