Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f101038d8d1f0f…

MALICIOUS

PDF

54.8 KB Created: 2020-08-22 23:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e39ecef4da82b817e280d9e1eed0abe SHA-1: 75d30e1dbf5404690152757363f624632f023103 SHA-256: a1f101038d8d1f0f502b70ed9f99bcc7b625e5174e5f05eb2b46d57a50799b7d
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 external PDF files, indicating a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking URLs, likely to appear legitimate. The primary attack vector is a social engineering lure to trick users into clicking the malicious link.

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=hospital+management+system+admin+template+free
    • http://xaniri.summerjhb.com/uploads/1/3/1/6/131606165/744f5c8b33aca6f.pdf
    • http://figifiset.discoveringscienceisfun.com/uploads/1/3/1/4/131483281/6552938.pdf
    • http://files.katherinegaulke.com/uploads/1/3/1/4/131437418/3611806.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/apprendre_le_portugais_gratuitement.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0460/4094/0708/files/bangla_cid_video_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0436/7597/5830/files/21849923415.pdf
    • https://cdn.shopify.com/s/files/1/0466/2856/9253/files/53827979947.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/71586285155.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/birthday_invitation_template_maker.pdf
    • https://cdn.shopify.com/s/files/1/0437/7519/7346/files/76473103908.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/jotulozusebawir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/vonujefixed.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_off0000987b.bin
238a3336fce6b4ccf46eaec5980a339967508590232e0eef3575b548921143a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x987B 5424 bytes
font_01_sfnt_off0000aad9.bin
58e6fa9f57c0c06b4f362939bfd48b68fe1300dc71e9c5ff5d5133eaa64f9151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD9 10248 bytes

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