Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd3137ce7aeca2…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 17:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4febfd7d09fe06dc83bb297212167a4f SHA-1: 4546a1a08a590e1dbff8f5b5989cba5523393d1c SHA-256: 35cd3137ce7aeca25533301068a29254752202a436f39b85454d48dc6a4e350d
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=english+abc+worksheets', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'English abc worksheets', suggesting a lure to entice users to click the malicious link. The PDF structure and link farm indicate a social engineering attack aimed at redirecting users to malicious content.

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.cc/pify?keyword=english+abc+worksheets
    • http://files.doorway.org/uploads/1/3/1/4/131407155/ruxatire.pdf
    • http://files.hometoaz.com/uploads/1/3/0/7/130776267/remigabixujalubofif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/razofavijir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/vefunepizaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/kojupax.pdf
    • https://cdn.shopify.com/s/files/1/0438/1261/8402/files/char-_broil_performance_seriestm_t36g5.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/tepavomuweloriwubeta.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/16935952428.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/62177144137.pdf
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/45746050268.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/loxojegojofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/horde_questing_guide_bfa.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_off00006296.bin
f6742b050ca1c7ebfd9e3e733a557fb5cdfaa1d9a81d103cd99f867c7099c48b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6296 5316 bytes
font_01_sfnt_off000074b3.bin
96ddef0ab439649ce6b0cd6dc384337fce1f2d59b3297b076e23f8dae53d6d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B3 10424 bytes

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