Malicious PDF — malware analysis report

Static analysis result for SHA-256 c094b85757780a55…

MALICIOUS

PDF

51.5 KB Created: 2020-08-06 13:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4509c37b6edc185d7262e16fc92eaa6 SHA-1: 95771b6f802d7b717b02b3d5d4eae59b8ae9406a SHA-256: c094b85757780a5535c918e330b88ff23fdfcb70aad33049d8cda283961d852c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.com/pify?keyword=alimentos+permitidos+para+diabeticos+tipo+1+pdf', is used to redirect the user. Another heuristic indicates a PDF link farm, with the initial URL pointing to 'https://cdn.shopify.com/s/files/1/0431/8278/4676/files/kowanep.pdf'. The document body text, though heavily obfuscated, contains the same lure text and URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=alimentos+permitidos+para+diabeticos+tipo+1+pdf
    • http://files.yichichou.com/uploads/1/3/1/3/131398360/2795725.pdf
    • http://jeludava.michaelblooman.co.uk/uploads/1/3/1/4/131407406/giwini_tisevor_fojada_belugewu.pdf
    • http://files.marriedmeakiwi.com/uploads/1/3/0/8/130874119/fetupetiloxubov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/kowanep.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/80731590273.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/vigusok.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/pukaruwazaruxam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/supanavabox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/57592005584.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/7271353042.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/jujeluv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/53626195990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/jovudufowidowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/keranejunezo.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_off0000879d.bin
8a200cc247dbcaa98f9853afb96e0253453cd6c2c4f17e12bc4ad37043b1b110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879D 5480 bytes
font_01_sfnt_off00009a2d.bin
fe5aacc7c1fb5b6d679cabc2c3a33d9c76c2a089a3956323428fbe33848c5e73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2D 11288 bytes

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