Malicious PDF — malware analysis report

Static analysis result for SHA-256 735d8e36499aa14a…

MALICIOUS

PDF

158.7 KB Created: 2020-09-01 00:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6567bfb8d67d0d51cc78b6f21307ce20 SHA-1: a8fdfdfbe6b693dae6ea627f6af7c5b28ec43be1 SHA-256: 735d8e36499aa14a91fa37b4b2ea4491ec6e66afe18ded55e180f745df2e9fa4
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'community acquired pneumonia guidelines update' and urgency language, suggesting a phishing or social engineering lure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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/wix?keyword=community+acquired+pneumonia+guidelines+update
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/4438/8246/files/50932678979.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/10474772777.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/52929323444.pdf
    • https://static.usrfiles.com/ugd/e2c250_c2ab7a5ea9684502847793a5c79f6ee7.pdf
    • https://static.usrfiles.com/ugd/b13fd1_b3d855328a204147a3f3d8be42ae4b22.pdf
    • https://static.usrfiles.com/ugd/5e8de6_170dcf04177a407bbde034048dac1d2b.pdf
    • https://cdn.shopify.com/s/files/1/0433/8820/7254/files/zuxumikivanodazeluxurebir.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/92802658682.pdf
    • https://cdn.shopify.com/s/files/1/0434/9893/0341/files/formal_debate_rules_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/80552947644.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022023.bin
55265bfabf74c15ff979c273a5e9d49beba6da1aa844a5084e886e05bac501aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x22023 5528 bytes
font_01_sfnt_off000232d2.bin
c5bbd20805828a551f41e4db324088e9ed983509d2dcf56f9693a5eda9bb91fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x232D2 10800 bytes
font_02_sfnt_off00025772.bin
70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e
pdf-font-stream PDF embedded font (sfnt) at offset 0x25772 16152 bytes