Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb41d19a43debcac…

MALICIOUS

PDF

46.8 KB Created: 2020-08-19 08:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79210d946d9c100dcf4bb4ae99715c1 SHA-1: 46d4f98e6ee5eaed562e50e4b2422f75f0f24457 SHA-256: eb41d19a43debcacadcfb668efa60d906fd655741d6d835306b4ec7d1dc50cd8
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'https://ttraff.com/pify?keyword=types+of+friction+worksheet+middle+school'. The document body, though heavily obfuscated, also contains this URL, suggesting it's intended to lure users to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=types+of+friction+worksheet+middle+school
    • http://files.easthamiltonspiritualchurch.net/uploads/1/3/1/3/131380251/1304572.pdf
    • http://files.davezinncreative.com/uploads/1/3/1/3/131379615/40412.pdf
    • http://files.ctfusa.com/uploads/1/3/0/7/130775174/vadonowipowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/mubaxutijakilaminajekog.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/maworilebewelawukenimid.pdf
    • https://cdn.shopify.com/s/files/1/0440/3127/9269/files/concussion_movie_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/repasozopajogevux.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/36781572948.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3833/files/nasurobebefuzete.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/fashion_clothing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/jibogedizuvamulukobegis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9251/files/53637213230.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/aggregate_soundness_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/dead_frontier_wiki.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/
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007707.bin
114aa6f36e1b1e6ecb686a59627f3a77158f1cdddb1111640c547e78887f9a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7707 5392 bytes
font_01_sfnt_off00008950.bin
071b6e9d86f4d87e0c05ff41a69c202f4b1ab51f6befe0ad7b2659b78c547cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8950 10780 bytes