Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a71ac13bcb14fa3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 23:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4422f13ebf2e0461a9b6cd97c685d6d SHA-1: 248d369d58a8889695bdc92c5a8bbd0e79f1d9c0 SHA-256: 7a71ac13bcb14fa3a3d7164ee14979a6de9591c87d796113a20545eced8dde82
174 Risk Score

Malware Insights

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

The PDF contains numerous links, including one that redirects to malicious infrastructure, masquerading as a free PDF annotation tool. The document impersonates a cloud file-sharing service to encourage user interaction. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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/pify?keyword=annotate+pdf+free+ipad
    • http://files.octhouse.com/uploads/1/3/1/3/131381288/zutesikapo.pdf
    • http://files.cnpstudiotour.ca/uploads/1/3/1/4/131409761/pegofuguzojapavotul.pdf
    • http://files.charlevoixweddingpastor.com/uploads/1/3/0/7/130739225/ed92fedcab80.pdf
    • http://pamatofek.mfala.org/uploads/1/3/0/7/130739919/4563161.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1062/8511/files/sickle_cell_disease_complications.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/24272814047.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/56974714309.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/butebiteve.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/benalodetopixefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/juxilejunimasaruwurex.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/firebaxavusominenodukomox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/98644347363.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/three_billy_goats_gruff_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3969/files/65338009671.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/tedisijufaxibusamas.pdf
    • https://cdn.shopify.com/s/files/1/0429/4357/8278/files/xidedobakolewom.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_off00006ed0.bin
9bc6474feab456c9a510dcc878c051b1f2f98b05847fe92b5cef91f853e7c7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 4812 bytes
font_01_sfnt_off00007f39.bin
08b4df91226e3ddbdf4ed4d56e69e7a21131cfa2d58111fb5ae9e6062960879e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F39 10608 bytes

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