Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd77a3068b7e983c…

MALICIOUS

PDF

68.5 KB Created: 2020-08-20 23:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1732d4ad3d03147a3eef02b90d06c879 SHA-1: 370ec3c975a17b4bdc63c8f0e043c241fe1cce4c SHA-256: bd77a3068b7e983c40a3b39cce4f88f0c46744e9eb3fea71f6fdf5124bf80d2c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with 20 identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=bootstrap+3++button', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL.

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.ru/pify?keyword=bootstrap+3++button
    • http://files.alphaapparelky.com/uploads/1/3/0/7/130775588/lakuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/jasafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52209678420.pdf
    • https://cdn.shopify.com/s/files/1/0438/8362/6651/files/41216162147.pdf
    • https://cdn.shopify.com/s/files/1/0429/6792/4899/files/44779001684.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/61700869231.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/davitut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/curso_de_ingles_para_nios_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0447/0842/9977/files/properties_of_alkyl_halides.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/satomidinarixutow.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/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c046.bin
e790376e1116ba82772cdc961e748082e7c938cb8346fd71578f7e04f5cd8559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 5136 bytes
font_01_sfnt_off0000d1c7.bin
56adb01479e759a26c0f8d968e2ffe8ffb33f7528a21d5f562afd655bed33049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 16764 bytes

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