Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cab7ff9ad4c986…

MALICIOUS

PDF

46.2 KB Created: 2020-08-21 21:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f36bfe9bf2f5b0b0d7f7a868b940858 SHA-1: 7d3974770396de1e8968a4ce4a00c3f9d265c006 SHA-256: 17cab7ff9ad4c9861ad042490c30edddd8f30958c2c2ae1eb25df4a82d0f7612
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to 'financial budget apps' and a URL that appears to be part of a link farm designed for SEO manipulation, likely to attract unsuspecting users. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests a phishing or malware distribution attempt.

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=financial+budget+apps+android
    • http://files.tivertondramaticsociety.co.uk/uploads/1/3/0/8/130814769/vosuwidaju.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://jolovebi.ailienvuong.com/uploads/1/3/1/0/131070718/56791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/vuvakevuxiguposudoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/virtual_reality_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/98953678144.pdf
    • https://cdn.shopify.com/s/files/1/0461/8980/5731/files/splashtop_wired_xdisplay_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2774/files/caste_list_in_ap.pdf
    • https://cdn.shopify.com/s/files/1/0458/2866/9603/files/boost_juice_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/exclusive_agency_vs_exclusive_right_to_sell.pdf
    • https://cdn.shopify.com/s/files/1/0431/7213/5074/files/68475626312.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/62562475626.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/compress_mac_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/75720573628.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ae.bin
34b793a8b16b63e88d5bdc3d6946dff7a2668bc1e75891f4d1d7ec22861fc308
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 5336 bytes
font_01_sfnt_off000087cd.bin
62b3d3d7ad8988ced66eb8aef7fa8c139a80963ab2817806572c83eedd812faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x87CD 10684 bytes