Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86b4dd08758215…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 17:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c463a4ce2591eb8aa9fca93bd9cf1f SHA-1: 138513c1702d7fbab5ee4256e3aafe2c176e71f0 SHA-256: aa86b4dd0875821519828d8ebc2f355f1b50788fb8874ef42ad9c9ce38872dda
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign content, but one critical link leads to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=kalyani+publishers+zoology+books+pdf, which is flagged as malicious. This suggests the document is designed to trick users into clicking a link that ultimately leads to malicious infrastructure, likely for further exploitation or malware delivery.

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.cc/wix?keyword=kalyani+publishers+zoology+books+pdf
    • https://static.usrfiles.com/ugd/b8c837_75a434bea9084e5ca4fdfe3bb1499848.pdf
    • https://static.usrfiles.com/ugd/429b25_347251fe996d4df988b1e4dd744f98a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_928557fc88504efd843ea792ab26c7a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/high_cholesterol_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/26026272138.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/94363546479.pdf
    • https://cdn.shopify.com/s/files/1/0431/7711/5812/files/tet_ogre_ring.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/87992206068.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4176/files/49658075840.pdf
    • https://cdn.shopify.com/s/files/1/0437/7460/7514/files/83424077202.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/sorrento_wa_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0447/7698/0629/files/left_navigation_menu_bootstrap_4_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/around_the_world_in_80_days_children_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1008/0420/files/image_converter_psd_to_jpg_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/1179283890.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_off000062b0.bin
63defc82ee63e186bd980d1cfe728a935b496e66921c5350d6fb1cb6f7559e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5628 bytes
font_01_sfnt_off000075cc.bin
6776394f9b8c49e181e9e5431dbae62cbdc8ea02ddc5bc5ce0ee7c5c2c7f9c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 9844 bytes