Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d23fd2d5ab6eef6…

MALICIOUS

PDF

52.5 KB Created: 2020-08-12 13:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b61b1064b76b3fa56202b8aa6cb5e20 SHA-1: 819d18db26a5b168d14534bf878ff96633bd04d2 SHA-256: 3d23fd2d5ab6eef6f2562c8c7dc6a30aa3c7a20a7c53545512cd68acc7e461d9
128 Risk Score

Malware Insights

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

The PDF file contains a lure suggesting an invoice or form, and embeds multiple links. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of numerous links, including a link farm on Shopify domains, suggests a broad distribution effort.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=af+form+4009+pdf
    • http://files.highschoolsportsleader.com/uploads/1/3/1/1/131164124/5349319.pdf
    • http://files.htecauto.com.au/uploads/1/3/0/8/130873851/8718362.pdf
    • http://files.edutwny.org/uploads/1/3/0/7/130775129/66e02.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/autodesk_recap_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/93503633511.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/66555374809.pdf
    • https://cdn.shopify.com/s/files/1/0430/9922/6279/files/9588168809.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0448/0807/7473/files/brian_greene_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/75513202175.pdf
    • https://cdn.shopify.com/s/files/1/0436/2859/3315/files/25777317245.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/6508707284.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/rotex_pneumatic_actuator.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_off00008f4f.bin
339311ac0927ae219986fcb0f8d05d1c64be2310d22fbb9d7f6438453baeb8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4F 5144 bytes
font_01_sfnt_off0000a0b8.bin
f1b428f0694c0dc26713917cd70f365b6b6361466ff3c9168317b2bf70f5971b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B8 10468 bytes

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