Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f02598c491c6b1…

MALICIOUS

PDF

33.9 KB Created: 2020-08-13 22:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c49312f8aae1982d6569fbd6e4d7dc SHA-1: cc750ce742d1f2c61682c14623cabf286f51d8b9 SHA-256: 21f02598c491c6b1abce24f1bf03ce9bfe77aed4ca67fefca7f5059cab5e1ae2
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 a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though partially corrupted, contains text related to 'Alita battle angel tamil trailer', suggesting a lure to attract users to click on the malicious links. The ML classifier strongly flagged this PDF as malicious.

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=alita+battle+angel+tamil+trailer
    • http://files.chronicallybeautifullife.com/uploads/1/3/0/8/130874201/9949976.pdf
    • http://files.tanooklings.com/uploads/1/3/1/4/131410685/bibavogar.pdf
    • http://files.level2rak.com/uploads/1/3/1/4/131455832/jalinunosawanab-rekufere-fevigomoset-vepewovenesuwop.pdf
    • http://files.drryanjones.com/uploads/1/3/1/3/131379639/555d875d8c6d34.pdf
    • https://cdn.shopify.com/s/files/1/0439/1659/1272/files/wasted_years_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/tanolodamumodameda.pdf
    • https://cdn.shopify.com/s/files/1/0449/3679/0171/files/balochistan_issue_and_its_solution.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/white_plume_mountain_3._5_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/11871895471.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/36790836742.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/gomofekekej.pdf
    • https://cdn.shopify.com/s/files/1/0431/3088/0162/files/bazemokukaforofuzujotedel.pdf
    • https://cdn.shopify.com/s/files/1/0436/0765/4563/files/52511522073.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/el_cerebro_libro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/accidente_cerebrovascular.pdf
    • https://cdn.shopify.com/s/files/1/0434/1822/2753/files/lobowuwunekokaxijoxal.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/exception_handling_javatpoint.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_off00004a26.bin
f77ff3d21b8b7fec913c307f9e4874cc1385c478dc1762961d59ddc597d91262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A26 4956 bytes
font_01_sfnt_off00005ae7.bin
d7d503610d04e865982eb9ddd3af3919945f0f3937dd8259869b5020c28bb3e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 9368 bytes

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