Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bcfd9a0da46ff5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 22:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3276d13d61216674111a9eb646162654 SHA-1: a9af1ce72142868fefa7047939959a95c3bf50bf SHA-256: 17bcfd9a0da46ff5a04d1826aed658680fa776a161dfc917ca06310bff731bfc
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead the user to a potentially harmful site. The document body, though obfuscated, contains the text 'Yelp fact or fiction sheet' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=yelp+fact+or+fiction+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/losevavedutagekovi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0237/8915/files/95665425314.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/vifafusesigig.pdf
    • https://static.usrfiles.com/ugd/1b8612_ce7f4f32d1e0467e8246a49987672107.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3ac721f6209430e97512b755d429ab6.pdf
    • https://static.usrfiles.com/ugd/16a96a_dcbf40ce6dba4221860624a6bfee0061.pdf
    • https://static.usrfiles.com/ugd/b8c837_b72dee6326534a7fa73e2601425d7c25.pdf
    • https://static.usrfiles.com/ugd/e3834b_890ec416af504440aae2e662fe372652.pdf
    • https://cdn.shopify.com/s/files/1/0431/1420/1241/files/67316945770.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/88426315493.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/pubajugizojunasexixole.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/flow_cytometry.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/fotolia_answer_4_letters_144.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_off0000792a.bin
da26fd8d68d1dcd7a5da6d1318c43f96d4adb4519fad98b1c9b3b616629c57ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x792A 5064 bytes
font_01_sfnt_off00008a61.bin
a99eb850b2550903a1f87981eee68722e01a872832c49f9e84e90ecf597aafec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A61 10640 bytes