Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adfa8b0b0a67304…

MALICIOUS

PDF

48.3 KB Created: 2020-08-10 06:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3e9b3cad9198db0257b47c29982e69 SHA-1: 5ee44482f3841fefe76f636a2e816df4bd5b91d9 SHA-256: 1adfa8b0b0a6730426d849bb61700c4c27441944eaa1f25f2ef65e41afd0d8bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to known malicious infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the text 'Geometric shapes worksheet pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.cc/pify?keyword=geometric+shapes+worksheet+pdf
    • http://files.alebml.com/uploads/1/3/2/6/132681647/8464764.pdf
    • http://files.detroitbracelet.com/uploads/1/3/1/4/131453177/gidokodoma_radekuripadim_naparu.pdf
    • http://bogizefig.sunburylionsclubofohio.org/uploads/1/3/2/6/132681026/8248fd9179c055.pdf
    • http://files.rogerconlon.com/uploads/1/3/1/0/131070331/1703251.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/22003419254.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/vasetubotetitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/engineering_mechanical_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/98987336793.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/97685263201.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/napajokosunezosusubozoli.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/74820253823.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/pigetalimerolojojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/sarafego.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/teacher_service_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/texanobinoxaxo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/smoking_and_spontaneous_abortion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ffa.bin
6922a60cc29b41f83b1447e4dffbd91913f4b3200da0addf8cbd6ab381d5a417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFA 5232 bytes
font_01_sfnt_off000081e0.bin
25433d1ad627bc8ffd0ff52e3dd93e8eb1d29a3b70888f691aa48f90ecc6a295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E0 10524 bytes
font_02_sfnt_off0000a5e0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E0 4324 bytes

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