Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c150e0f9010303…

MALICIOUS

PDF

35.1 KB Created: 2020-08-17 15:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1793c235bf0fa4b95a69927f4faa7669 SHA-1: f57f6694df0a9ea762c0b62f84b51f839ad6aaf9 SHA-256: 97c150e0f9010303f3ef55a71cd5627f92cb7fe1ba3e7158347924f6e2d9b4bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'sheetal gajak online'. The ML classifier strongly indicates maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL. The primary attack pattern involves tricking users into clicking through a link farm 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/pify?keyword=sheetal+gajak+online
    • http://boxel.vinyllegendphotos.com/uploads/1/3/1/6/131606069/6210709.pdf
    • http://zeloza.voicecarephilippines.com/uploads/1/3/1/4/131437657/jojuriliweborir_rarejiwod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/annex_16_volume_iv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/body_parts_activities.pdf
    • https://cdn.shopify.com/s/files/1/0434/9535/8624/files/10555623129.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/wameguj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9136/0934/files/affairscloud_current_affairs_monthly_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7615/files/confidential_report_1955_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/21396641961.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/bodokav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/21587577856.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/samexebufanuxaradaminami.pdf
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/circular_motion_target.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8095/files/walmart_cash_register.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/situation_analysis_marketing_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/bewitched_bothered_and_bewildered_music_sheet.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d59.bin
8e63e65b3cf909a94729f41b9844ead0556aaf924b2aea436b312e4ded3d011a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D59 4916 bytes
font_01_sfnt_off00005e15.bin
a01cb62628f4ea24190cde844e474a4c65a12940d9231349f4dd0f24c1f71aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 9924 bytes

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