Malicious PDF — malware analysis report

Static analysis result for SHA-256 09515e0a92ca8160…

MALICIOUS

PDF

39.5 KB Created: 2020-08-07 08:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4214085a64086478d1141496e17cbdb8 SHA-1: ea9436673c332b7cd35f4ee9313a38cc1fc76b9b SHA-256: 09515e0a92ca816056ffc6e438418c6c6f4203a7cea29fe04e754bd34612249d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content, possibly a phishing page or malware download. The ML classifier strongly indicated maliciousness, supporting the presence of these links.

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=ataxia+espinocerebelar+tipo+3+pdf
    • http://kazabo.nfordtransitsystem.com/uploads/1/3/1/4/131408899/6dd06.pdf
    • http://fobituv.discoveryourpurpose.net/uploads/1/3/1/4/131437812/navejaduna_wunivoxunuga.pdf
    • http://roreduj.fwgreenandblue.com/uploads/1/3/0/7/130738993/bdf22d8f.pdf
    • http://files.tafffurniturestore.com/uploads/1/3/2/8/132815004/227989040e.pdf
    • http://kiler.darrenellisdance.com/uploads/1/3/2/3/132303382/1947373.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/99083033290.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/44300522918.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/57606366070.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/lebasesemop.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/3033210016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/86194361352.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/21831902549.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/ketubufaresejenebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/kuwenuwekerirox.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_off00005c80.bin
3f21f479a4632dac1c4fca97abb580ded392faabf71a902bbe9ca67a0629805e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 5508 bytes
font_01_sfnt_off00006f4b.bin
dd3d41912c78d2b1be9290a5539b02d7ad973d0214c1c82ec4be171773ec32ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4B 9960 bytes