Malicious PDF — malware analysis report

Static analysis result for SHA-256 759caf13bb270c32…

MALICIOUS

PDF

50.8 KB Created: 2020-09-01 01:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 777365dcb33cc99024b0ef74ef6325ad SHA-1: 3c9551bd1633fb12e893f482fc6d2d0d9c0c4085 SHA-256: 759caf13bb270c324351fa0ad6f3f741b37f1d545479ff7158166a2fc5f44791
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to educational content, aiming to trick users into visiting the malicious link. The presence of a callback lure heuristic further suggests a phishing or scam intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=simplifying+exponents+worksheet+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/ave_maria_lyrics_latin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0462/7261/0464/files/fortinet_100d_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/genitoseluziwotefutot.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/dekimozibap.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/ralojavadil.pdf
    • https://static.usrfiles.com/ugd/96bf9d_bfc101dfc23944318539e0ed8420b956.pdf
    • https://static.usrfiles.com/ugd/4c76bf_8c95579658494b968cbba337bbc6706f.pdf
    • https://static.usrfiles.com/ugd/48d9a1_149ea385522f42f5b29a8e4bf184319c.pdf
    • https://static.usrfiles.com/ugd/e6092c_f89b67ff5cf04fbca12a39682329121e.pdf
    • https://static.usrfiles.com/ugd/b8c837_086d752e20924578be7c702e81248317.pdf
    • https://static.usrfiles.com/ugd/d55797_f5551c88307a48ff9b7ad401640508d0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b60.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B60 2828 bytes
font_01_sfnt_off0000855b.bin
d5fc4cb451e84fac22fdc949c228b9c189a254c225bd34cd4bfd0fac36136ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 5884 bytes
font_02_sfnt_off00009957.bin
4dd2d39546eef8bc1c8129e93c3fa54bf98ab25b82a63a2479f64d920dfd527c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9957 10168 bytes

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