Malicious PDF — malware analysis report

Static analysis result for SHA-256 74947b2c0b080cf5…

MALICIOUS

PDF

46.5 KB Created: 2020-09-05 17:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3eb1e38db22ab8ca36babc56d2d0d61 SHA-1: 7e037a3e3d4163c3708c309c5fea1b5ea63630e9 SHA-256: 74947b2c0b080cf5145e661c266e81c439e870e31ba57a1bea4a6945769797f3
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector service, which is a common technique for phishing and scam campaigns. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to a worksheet and the malicious URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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.club/wix?keyword=solubility+of+salts+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ab0441_8d42e0273d374fac9eac03f3e1de232f.pdf
    • https://static.usrfiles.com/ugd/01bc73_e366eb6d8c9d4943bc6749b872653f83.pdf
    • https://static.usrfiles.com/ugd/5ad03d_a8ffe389cd63419f85d4e56743778bbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c69bc9f6b1d746459ab5fe9d771c4fa2.pdf
    • https://static.usrfiles.com/ugd/822ecd_e0b159dadc5a4722a349b8988f065a8d.pdf
    • https://static.usrfiles.com/ugd/a8c229_60d038d5d64242a486de3580c01d1fdb.pdf
    • https://static.usrfiles.com/ugd/6f9b04_b880fd6af4634d219f75a974b034ff7f.pdf
    • https://static.usrfiles.com/ugd/8b49c6_da7f928f09ae48da91c997f380bec10a.pdf
    • https://static.usrfiles.com/ugd/4c4e45_6ff6f0cf27d149bc86927980ba31b652.pdf
    • https://static.usrfiles.com/ugd/8d5d69_7944d779c99142b9b25485a83de806bb.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_af5b1ea297ba47e4a5c3a1c8d5632493.pdf
    • https://static.usrfiles.com/ugd/fa32a6_e42c07c11ddf4d479059c65d0b486079.pdf
    • https://static.usrfiles.com/ugd/143c98_1cc01801c7714ef4a4b45a0109e81458.pdf
    • https://static.usrfiles.com/ugd/8bf3fc_fb91af3e87634318899b0539d09b3e9b.pdf
    • https://static.usrfiles.com/ugd/0a593f_c7fd28df5e37429fa03f4c061eae8347.pdf
    • https://static.usrfiles.com/ugd/21a131_fb48029210864a39b1fac8daa87be510.pdf
    • https://static.usrfiles.com/ugd/21e6f2_99a50c44bed046eaaec036800722e551.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_off000076ba.bin
5702a593a086e12136db7cb3bd5c74004273d9d7bf7abea914d7a2f5e638a5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BA 5356 bytes
font_01_sfnt_off000088fe.bin
0509326c0420e33bdc5af1c4463c75e771cbae164b8dc89d4fa7ee3488d9721e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88FE 10592 bytes

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