Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f52e8b0ddf64df…

MALICIOUS

PDF

47.9 KB Created: 2020-08-05 04:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37cf448bde7644126790e50a30531c3b SHA-1: 7c780a59d3d2190a24ebf91343f9da1772cd35c0 SHA-256: 98f52e8b0ddf64dffc42c7f84edf0d7fa09686db7980006697b2fb18e403bceb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, contains text related to 'sujet brevet 2020 maths corrigé pdf', suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely used to host further malicious content or phishing pages.

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.com/pify?keyword=sujet+brevet+2020+maths+corrig%25C3%25A9+pdf
    • http://files.localdmvhomes.com/uploads/1/3/0/8/130814232/6354617.pdf
    • http://files.pacificbrows.co.uk/uploads/1/3/1/4/131454286/3c8bdf7478116.pdf
    • http://files.sitprep.com/uploads/1/3/0/9/130968988/5417536.pdf
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/41238003701.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/fibexejub.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/solutions_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/dukemivamijurabaropito.pdf
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/heidelberg_catechism.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/4836784889.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/53588562788.pdf
    • https://cdn.shopify.com/s/files/1/0440/7066/6390/files/dufulodilomuw.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/87629645839.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2354/0124/files/58042816652.pdf
    • https://cdn.shopify.com/s/files/1/0430/2641/5779/files/rei_s_minimap_1._7_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/dowry_prohibition_act_1961_in_marathi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006798.bin
a6e01d5b2d27ec5ffe68b31d6fe220a46bf49f10986db2e40b1c37b48778df4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6798 6108 bytes
font_01_sfnt_off00007c24.bin
1b1a22d6c0b0a01a5af7bc286e600a80dbe7ba0606ba517f0bd0fbdc2c1a4847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C24 11988 bytes
font_02_sfnt_off0000a28d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA28D 4324 bytes

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