Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ed8f26baa18517…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 11:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e4fca17e4812af678e6be5289eb343 SHA-1: 1d4b0bd1fa35c2434cbeda4d2ead77ce38f39e6f SHA-256: a1ed8f26baa185176b5a558ca9453776557ddcd9d1777065fcb4dd243d37268c
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cambridge IELTS' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

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.ru/pify?keyword=cambridge+ielts+2+listening+test+2+section+4+pdf
    • http://files.tadstastytreats.com/uploads/1/3/1/0/131071067/medesutiv.pdf
    • http://files.getting-the-picture.org/uploads/1/3/0/7/130775268/5b90c9d2399.pdf
    • http://kutoweb.dwellwithchrist.com/uploads/1/3/1/0/131070487/3cdc4e106.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/el_aguijon_de_pablo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/dewebexuzaketajod.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/54488539592.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/23322853526.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6813/files/lalopexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/psychology_4th_edition_by_ciccarelli.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5610/files/16463024814.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/93772314649.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/lewiruka.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/sword_modifiers_tinkers_construct.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/dasubulute.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/altivar_61_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/91507879446.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_off00006461.bin
70a7168a3bc161e6cde943880ce6235baf1ee00a2a15370853e8e4210e08b896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6461 5740 bytes
font_01_sfnt_off000077cd.bin
830b1128de9f3c29121038cf8833b0e0d4b8d2d17b2236e54a04a65debd75b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 10780 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.