Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbe5b469c9ba84d…

MALICIOUS

PDF

46.4 KB Created: 2020-08-21 12:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd62e8d302b5049e2bac65b4dca9d63f SHA-1: e40ee70506f5c089b322ec9abce85cf23e49f655 SHA-256: adbe5b469c9ba84d7d9bc14f798130c8119c370b5ae7b282e0af621a47e5e88a
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary redirector URL is 'https://ttraff.com/pify?keyword=chefdom+mod+apk', suggesting a lure for modified application packages. The document body also contains garbled text alongside this URL, further indicating malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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=chefdom+mod+apk
    • http://demanutev.blackdogjewelry.net/uploads/1/3/1/3/131379732/fukawup-mumixavuga-birewurezun.pdf
    • http://robidepul.wscotthughes.com/uploads/1/3/0/8/130873951/puter-koxinipasete-miwoxodan.pdf
    • http://files.acastillocabinetry.net/uploads/1/3/1/1/131164168/filewurud-wunuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2664/files/4956500673.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/wiwonixipi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/66196214888.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/chemical_properties_of_alkenes.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2207/files/pivupaxegigerokal.pdf
    • https://cdn.shopify.com/s/files/1/0446/3758/5571/files/what_is_john_kerry_s_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/repenibarazonijun.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/kuzezejaxamotux.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/pilizaxiwevaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/2001_monte_carlo_ss.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/monawamopukadibaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/33292149624.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b19.bin
28c050c769141761e6939b97f3e59622b3917322c116b21fe9481bfb4b2d6643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B19 4944 bytes
font_01_sfnt_off00006bc6.bin
ee62af00421b0aafd102b52526ee3ed257a758ba91c46f8df0ef076ec2d5c118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC6 1936 bytes
font_02_sfnt_off0000752c.bin
f683208ca3f0095b9b38ba4f635e46d433d7185165fe5f154609a8af119dbd2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 10136 bytes
font_03_sfnt_off00009810.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9810 16036 bytes

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