Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d147c674c11dc0…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 04:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d977c692f49da481c9b46253c105c2 SHA-1: aa7c07b032caa672b58e2443ecc96811693359e4 SHA-256: 80d147c674c11dc00e8148d9e51c0a79450d50ac12cfa92a5246159360fdccad
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one prominent URL directing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing numerous external links.

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.ru/wix?keyword=fusionner+plusieurs+documents+pdf+gratuit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/a2ebd8_bc10cdb2a4d24bdd80b8e3898f64d5c1.pdf
    • https://static.usrfiles.com/ugd/735189_a1a937fd99c64d2d99f2caf19a165491.pdf
    • https://static.usrfiles.com/ugd/07ef24_6e4dcd8c0c27466188537fa450fc7cb9.pdf
    • https://static.usrfiles.com/ugd/a107db_69354baf50ee4c6b83d88d341e64b10c.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/gamutufonix.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_ccd0290529594a36820eb1acfbfd46ee.pdf
    • https://static.usrfiles.com/ugd/74a852_8ece877db9e54ea4a483a2a5c07610c0.pdf
    • https://static.usrfiles.com/ugd/191a6d_5652a1f5e44342f28a003e82bf376b4f.pdf
    • https://static.usrfiles.com/ugd/3ce946_8e7da019d6b747689ae354d039db0d91.pdf
    • https://static.usrfiles.com/ugd/91e123_7a9c66ce39ed444a94726d6fd9d12f6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4e704b806b04769b2819c20efdb9da9.pdf
    • https://static.usrfiles.com/ugd/c618e9_2da15e073ce44ff78408e964f6fecfd0.pdf
    • https://static.usrfiles.com/ugd/45e30f_1cfc028a21a047a48603351450c42f0c.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_off00005e13.bin
4f44830378491ed22ae6507d81a65856320124da89400172d8c80255c57b3b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 5312 bytes
font_01_sfnt_off00006ffe.bin
2cff3cecff79fb866802e4adc3262dc9aae75912d35641b67aed6781e2192a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 11636 bytes
font_02_sfnt_off00009522.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9522 4324 bytes

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