Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a2dca5b55f86e6…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 17:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a27609788f5b6d4fa678b3bb72ecbd44 SHA-1: 408d7d864eed445a47a3872fb83f1eb8dc7b2faa SHA-256: 19a2dca5b55f86e6d96d6d434bd107f1ae81ce9ce15532ef86b090083db6c0c4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The heuristic PDF_SEO_LINK_FARM also suggests a large number of outbound links, many of which are likely malicious or part of a link farm. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=23+ejemplos+analogias+pdf
    • http://files.itartndesign.com/uploads/1/3/1/3/131379054/zegijoxiri_nifavanuke.pdf
    • http://files.drhcustomhomesandremodeling.com/uploads/1/3/2/6/132695339/00199.pdf
    • http://bamoxu.marmiger.com/uploads/1/3/1/3/131380600/jukobefasa_fasezov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/72457109333.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/jivikuxesixujinerejisenij.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/diviloguzoxisojasusire.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5033/files/alagappan_medicine_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5760/8864/files/karizogivudurunudujifofag.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/tijikirupafitefolawud.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/spivak_calculus_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4718/9670/files/51687437085.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/38038409214.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/66063681822.pdf
    • https://cdn.shopify.com/s/files/1/0439/0774/3899/files/joziravi.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_off00007204.bin
25d032228476d94333ccfa3e79aa1f1b374b017c33629f0bdbb0b1b9a4eb1d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 5544 bytes
font_01_sfnt_off000084d6.bin
308efeb7c227af0d6b376509837ce647d9b23c9ff958fe6fc6567f4322c2d174
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 11480 bytes