Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ac9b2c85171d84…

MALICIOUS

PDF

44.2 KB Created: 2020-07-16 12:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f208ab16937b2674b9112d2153323b SHA-1: 84fcfa0aa25cfdd75c0bfe6290bb3e6bd2d3c6fb SHA-256: f2ac9b2c85171d84d2023c7227494dca1d5ee2349323934ede78ffc374ad5445
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous links to external websites, many of which are identified as part of a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL pointing to 'ttraff.com', a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to file conversion tools.

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/wb?keyword=convertir%20a%20pdf%20editable%20gratis
    • http://files.sherpublishing.com/uploads/1/3/1/3/131398542/bf5eb688.pdf
    • http://files.beholdvisiodivina.com/uploads/1/3/0/8/130814914/bavesujuxo-xaloladijig-tefaxa-jinavusexisebuf.pdf
    • http://files.tucniagara.com/uploads/1/3/0/7/130740033/58967e0.pdf
    • http://files.clintoncountyleader.com/uploads/1/3/1/4/131407369/7798690.pdf
    • http://files.gillysplaceinkefalonia.co.uk/uploads/1/3/0/8/130813667/3983028.pdf
    • http://files.picturejapan.org/uploads/1/3/1/4/131453132/62702.pdf
    • http://files.cpsa212-arizona.org/uploads/1/3/2/8/132815882/vogefesojejer.pdf
    • https://tolefeguxi.files.wordpress.com/2020/06/vewakasenifadelitoxunede.pdf
    • https://sixujosoxet.files.wordpress.com/2020/07/bapalovolilewab.pdf
    • https://majemim.files.wordpress.com/2020/06/7354680340.pdf
    • https://razowavof.files.wordpress.com/2020/07/66469194698.pdf
    • https://banisozix.files.wordpress.com/2020/07/58227619830.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/wibowimepazeviwapido.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/durilobonoxadunujulofav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/7440904194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/556715435.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/70312672929.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/34278286612.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_off00006bb5.bin
9fddee572dfbe30149c249eb2b07074dd50b6974c0400808ff67f03d2b5d42ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 5220 bytes
font_01_sfnt_off00007d81.bin
2e188acc920b26d1ce1ae7beb7c0683df3c0fb448da3e59a95993eb89a3088b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D81 11948 bytes

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