Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b5d1155bb4acaf…

MALICIOUS

PDF

33.9 KB Created: 2020-08-03 21:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb54c83840bcb01e9ba6689262e6569a SHA-1: ad402092434e1ce3423fdfb83ec70e760b12e255 SHA-256: 42b5d1155bb4acaf7a7792573de5b82a4b4d6faf9dfc5f251b8b4d747a1ff0f3
150 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains the URL that triggers the redirection. The primary purpose appears to be directing users to malicious infrastructure under the guise of providing information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=tabla+de+centroides+de+figuras+geometricas+pdf
    • http://files.photosbysarahtucker.com/uploads/1/3/0/8/130873876/purisosotenibusifa.pdf
    • http://files.cerysthomasford.com/uploads/1/3/1/6/131606144/56ce721b227c7fb.pdf
    • http://files.3jtestprep.com/uploads/1/3/1/3/131379054/4423065.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/87382622553.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/business_letter_example_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0103/files/74353916627.pdf
    • https://cdn.shopify.com/s/files/1/0429/3040/5535/files/73022088291.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/wajos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/94871434873.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/66343273040.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/29801814169.pdf
    • https://cdn.shopify.com/s/files/1/0433/1782/1605/files/pegoxujobizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/78547883300.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_off00004585.bin
cf1514fdf3f2cbb864e3095c060a0dce2486f31484e104d6f64e1d06f8eb5409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4585 5564 bytes
font_01_sfnt_off00005856.bin
f26725b705d36d03ac3cf6604ddc23150deab11b110c850b5e96d6e48d723e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5856 10592 bytes

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