Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa87840fc37af58…

MALICIOUS

PDF

67.4 KB Created: 2020-08-23 01:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5823f7d63a070349e47d64a5530f3a6a SHA-1: 57e8d7f7e4021cb8489316bda0d21208f54e7641 SHA-256: 6fa87840fc37af58508ca2d82648d5d27fc76a3d68326ad6d387dcc27bbf6220
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to lead users to malicious infrastructure. The ML classifier also strongly suggests maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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=base+de+datos+sql+server+pdf
    • http://fobidiwi.sarahpetrich.com/uploads/1/3/0/9/130969959/bexixiweneduno.pdf
    • http://xeniniw.ratdragon.com/uploads/1/3/2/6/132695818/6671897.pdf
    • http://zowoje.berkshireheros.org/uploads/1/3/1/6/131606127/pifixulido-getevi-bigere.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/fusinelijowutazazugenaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/wixogujemupis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/75008736976.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/42123334513.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/35115642969.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/36440623293.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/nukuwifiwerosijifulonona.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0762/files/rawotonititisiv.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_off0000c84b.bin
5993b289ee1970e90c67657ab6834b5f3bd390275925b710141d4969a7a8d406
pdf-font-stream PDF embedded font (sfnt) at offset 0xC84B 5268 bytes
font_01_sfnt_off0000da4e.bin
e84b09ea9e06fc220d8bee0f8a9028e4e221421ed8e5b7f4e25a59ebaa8f3c94
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 12296 bytes