Malicious PDF — malware analysis report

Static analysis result for SHA-256 198d7337afeea473…

MALICIOUS

PDF

37.6 KB Created: 2020-09-16 18:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b38b899af86df8131f2f49589d72a9c SHA-1: 1c0623b76241d44376edfb6fcafb719a3d8ea171 SHA-256: 198d7337afeea4734b94fce0a567144da7f084efea9859c013699ff101ca4a06
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector and others pointing to a link farm. The document body, though partially corrupted, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=manual+orbit+sprinklers
    • http://files.charpentierteam.com/uploads/1/3/0/8/130874141/3144917.pdf
    • http://wotuweji.stmarkanniston.com/uploads/1/3/1/4/131453027/50618.pdf
    • http://rimoj.erjurself.com/uploads/1/3/1/6/131606168/kuwem-zejozona-zisavururonuse.pdf
    • http://mazod.eatswithmorg.com/uploads/1/3/0/7/130739916/3599838.pdf
    • http://misifed.floatingspecks.com/uploads/1/3/2/8/132814930/gupelejukas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://128cec62-55dd-4386-ab65-5e255045830f.filesusr.com/ugd/370ea2_e1748e9ad39240f7b3f0182e6e23ba37.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/11864031273.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/pasipelepapijawil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/xeleveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/richard_branson_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/clean_install_high_sierra_apfs.pdf
    • https://9bd27190-c78c-4691-96d2-d88f6256d7bc.filesusr.com/ugd/7be1cd_793139d0ceed43a3b5ac349b9883a4e6.pdf?index=true
    • https://56537dbe-08ae-4f93-8f93-e87cc613e69b.filesusr.com/ugd/696117_6a62a8cf5e4643bb91d4c6af64076f7a.pdf?index=true
    • https://c0092b09-f6d5-4924-b992-abe26a2179db.filesusr.com/ugd/ba2c19_4280a04402574e21892f201c4ebe5f1b.pdf?index=true
    • https://e91157f5-cc7b-479b-becc-e92433be3ef7.filesusr.com/ugd/c8683e_8726eb9ddc724ac68b01570f072c90cf.pdf?index=true
    • 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_off000056e8.bin
2537a5e6a37dbf76bf6aac13abc0a0a6d46fad1b5127be0930808debb5652f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E8 5020 bytes
font_01_sfnt_off0000680f.bin
23061e5d1d37895f5f383ae3283e0ff168c9e7f80e206f8f00ed5c9866b83aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680F 9984 bytes

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