Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd60d799650f294…

MALICIOUS

PDF

44.3 KB Created: 2020-07-10 05:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33cf84ce5ed115ebd117c4a8dd8af9df SHA-1: a488410d9088f7c870bbf8667dd006132cb8456a SHA-256: fbd60d799650f294558d28727f8a655846bda7f3de04dd7509ceeb4e0959d7fd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link, https://ttraff.ru/wb?keyword=mighty%20to%20save%20piano%20chords%20pdf, is identified as a known malicious redirector. The document body, though partially garbled, includes text related to 'piano chords pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=mighty%20to%20save%20piano%20chords%20pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://files.realestatesystemsofgillette.com/uploads/1/3/1/4/131482997/85d39700f11d5.pdf
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdf
    • http://files.kozaero.com/uploads/1/3/0/7/130739699/da9605216a8.pdf
    • http://files.pamelasanchez.com/uploads/1/3/0/7/130738710/e9c4e23.pdf
    • http://files.digital-decorations.com/uploads/1/3/1/3/131381103/6759332.pdf
    • http://files.ejacts.com/uploads/1/3/1/3/131384018/givebivusunilujogoj.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • https://fegawurirew696751846.files.wordpress.com/2020/06/82092492536.pdf
    • https://majemim.files.wordpress.com/2020/07/verixolilebup.pdf
    • https://likabizev485265161.files.wordpress.com/2020/06/luwinibo.pdf
    • https://finudenunidi889677175.files.wordpress.com/2020/06/xisanesuvefaraza.pdf
    • https://lukipidize.files.wordpress.com/2020/07/lafebidikadulafamez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006254.bin
fbbc1adc775354fdd26b8136c604f2f0b921dd52dc099f2f7b758b51d6d6d373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 5340 bytes
font_01_sfnt_off00007490.bin
903808906e2aa55d0376949b54d187f907d53118e6344ff29fd1bec4ca2915ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7490 15400 bytes

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