Malicious PDF — malware analysis report

Static analysis result for SHA-256 072fb3f018adcb6c…

MALICIOUS

PDF

39.8 KB Created: 2020-08-23 15:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89487c4b5deb7db8e3ef4de7801187a8 SHA-1: d3c9d573dcdbd169374e38776c3eb905214ff2cd SHA-256: 072fb3f018adcb6c2e940e4b7bf605ce215b433904beb6fa2126458f28451442
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to a URL that prompts the user to 'Install cinema apk on roku', indicating a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content.

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=install+cinema+apk+on+roku
    • http://files.davidbosephotography.com/uploads/1/3/0/9/130969897/wakut-tanerinaxobagox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/gixefuvunomapikudegosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/sscn_bkn_cpns_2018_formasi_kalteng.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/pure_imagination_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/bristol_fire_pump_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/7061/0851/files/vlookup_function_in_two_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/zibivefabedinepevoraxona.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/chrome_tabs_executescript.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/sabirodinuxusupuwepes.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_off00006181.bin
302793de6619cb30dae6a6c5551394461a39b199636f0ffcd6e9226af82acbb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 5080 bytes
font_01_sfnt_off000072a4.bin
d09cb37a087e0bc910c15f5477dc3b2c976c5ad1308711944c5aac6837b4566e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A4 9392 bytes

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