Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a3f9855ac2cdaf…

MALICIOUS

PDF

84.9 KB Created: 2020-09-06 22:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a35b088fc30df593051a257aeab4d24 SHA-1: dadfb866a084360057f334fa354b1a7605b26718 SHA-256: 14a3f9855ac2cdafbdc910de27ba4c78b24196c45c9ac82245d1df1a4306c02b
162 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Runescape dungeoneering skill guide'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=runescape+dungeoneering+skill+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ade4e6_e91d29eb49374ea7a0bcd911bbb18517.pdf
    • https://static.usrfiles.com/ugd/d4da64_67a39af60e964325a06881ad235a6eff.pdf
    • https://static.usrfiles.com/ugd/6c313a_2976ffb17c524cc78e883667997e95ac.pdf
    • https://static.usrfiles.com/ugd/9b5f63_d13b0d59e2904a92abcbf2528e7d4f0f.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/dynamic_vs_static_stretching.pdf
    • https://cdn.shopify.com/s/files/1/0439/3166/4552/files/90354298769.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/86489915156.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/11830560807.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/62789262047.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/88874152872.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/juroloretaveduju.pdf
    • https://static.usrfiles.com/ugd/5926b4_0e5ef5af1f604e80b6b80a483e17408a.pdf
    • https://static.usrfiles.com/ugd/80c1db_64c4de69cea44c1ca6c8473cfd463fb3.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_off00010d8f.bin
780208f0af7723761a375aaced615c13bcf709ef4dbc51f21f27957f728e0ed0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 5312 bytes
font_01_sfnt_off00011fb7.bin
91ffe00dc28f71dd76fd72db43f7a840933f5764845e329279a8d578375a031f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 11688 bytes