Malicious PDF — malware analysis report

Static analysis result for SHA-256 481c32ac4eeb34e5…

MALICIOUS

PDF

49.0 KB Created: 2020-07-28 14:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d641221fc626704c0fca4519af190f46 SHA-1: b021d77ecd8990cc91e0818f0a9d29c97e8fa03e SHA-256: 481c32ac4eeb34e5b7dcc14208896710c04ba22ec19790b6c04c4b08252d8b8e
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.com/pify?keyword=bitdefender+gravityzone++vhd', is a known redirector. Another heuristic indicates a link farm, with the first URL pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=bitdefender+gravityzone++vhd
    • http://files.carlosforta.com/uploads/1/3/0/9/130969957/932179e84bf130.pdf
    • http://files.neilmckenzieyouthfishingcontest.org/uploads/1/3/1/6/131606127/1963708.pdf
    • http://files.fotsga.com/uploads/1/3/1/3/131382346/17f2073eb.pdf
    • http://files.qutathleticsclub.com/uploads/1/3/2/7/132710783/wukegutisodobere.pdf
    • http://files.neilmckenzieyouthfishingcontest.org/
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/25940946263.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/femumupekurufijodiviti.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/88310728808.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/73538177855.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/lufujajolazunekus.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/zaboji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/39307570065.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/volurijisaxavutozumex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/boxavurivisidikukituno.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89120683065.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7253/files/biwasiramitapofarubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/17252688035.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_off000082b2.bin
08de86f9820cb7374c76c2b646a0575ff352271379b4160bde1f85ac83a6be03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B2 5008 bytes
font_01_sfnt_off000093bf.bin
9b903e1d79cfc97317dbfe149815465517d17d704a63a2d2d9b8456f9b5492ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93BF 10244 bytes

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