Malicious PDF — malware analysis report

Static analysis result for SHA-256 1168d537b6af72c3…

MALICIOUS

PDF

815.9 KB Created: 2020-09-13 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecb9465d3c28db134b4e82ec98458ca2 SHA-1: 4baf458ed683f6ad62c4db1095e23e791fee76ac SHA-256: 1168d537b6af72c36fc9280172d871c57a83201aa0d90127f60691914a90300b
134 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that, combined with the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic, suggests a social engineering pretext for the user to click the malicious link. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9026

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/wix?keyword=cells+building+blocks+of+life+worksheet+prentice+hall
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8e66a5_b48ca7cedb784664972ca05276bae5b4.pdf
    • https://static.usrfiles.com/ugd/d5cf39_18a858e681524599ab1ed364d5c84dc4.pdf
    • https://static.usrfiles.com/ugd/1d64af_73a981a8f2b14b848684ed43c6766f32.pdf
    • https://static.usrfiles.com/ugd/54dfea_713380c38d9a44719be65ce3f1b6f69a.pdf
    • https://static.usrfiles.com/ugd/7a359d_54b44caf07394d70b59aa096511381a4.pdf
    • https://static.usrfiles.com/ugd/badafb_dc2285749bef4697be8d40d3e816d37f.pdf
    • https://static.usrfiles.com/ugd/9d7ad9_8bd745d1aee646519a8298719935ee0d.pdf
    • https://static.usrfiles.com/ugd/7c30af_21029d75261d4177bcdfde9d47a7fc64.pdf
    • https://static.usrfiles.com/ugd/32777b_4a860982511a46f48c72cc9c7c716623.pdf
    • https://static.usrfiles.com/ugd/575fb0_862510b83f8c4806906471c510cc93c7.pdf
    • https://static.usrfiles.com/ugd/48bf55_a7d015dece994c7c88d98003ac46f424.pdf
    • https://static.usrfiles.com/ugd/b73feb_76acf09182ea402f9b6b2e5094bf481f.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/56407144242.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7550/files/uninstall_architect_4.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_off000c61f7.bin
1d310839b59ccdcc6e47bdf64e5038f0b69cca0aa9784bbd002d307c3f605a30
pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F7 5620 bytes
font_01_sfnt_off000c7522.bin
fb118c4621aa8a793d4189b69d49622ef6089fc69870039660e813fa924d1a60
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7522 16896 bytes