Malicious PDF — malware analysis report

Static analysis result for SHA-256 6252ca2210ba9b64…

MALICIOUS

PDF

40.0 KB Created: 2020-08-05 08:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55231168a136a5dcaa766f7ddcda1db7 SHA-1: 762db4b50a8eb2ee65e88935406bf8960e018041 SHA-256: 6252ca2210ba9b64006ecfdf35c478b99b48d1545515f49b079d418e79694335
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, masquerading as an Adobe PDF installer. The document also exhibits characteristics of a link farm, with numerous embedded links, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to trick users into downloading potentially harmful software.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=adobe+pdf+full+installer
    • http://rojajesix.stephanieflear.com/uploads/1/3/0/9/130969352/kupofamu.pdf
    • http://files.fusedancecollaboration.com/uploads/1/3/0/8/130874134/1107969.pdf
    • http://files.stevescustomcarpentry.org/uploads/1/3/0/7/130775528/jinederitupani-razujaxuted-wewefa-fegenapaxok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/43550253827.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/fexotuwabexejusafowet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/jebogopuzo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/82898618841.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/55842040199.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/valunozuxopene.pdf
    • https://cdn.shopify.com/s/files/1/0429/3020/8924/files/detizulolomikugelifis.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/weblogic_admin_interview_questions_and_answers_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/vexewonozexijatew.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/jofedoloj.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_off00005f56.bin
9ca5652c890fcaf55a20185c773871c263ae5870fcbe6ade39b7996f3ebea0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5164 bytes
font_01_sfnt_off000070f3.bin
9927d6db3239cbc5a1b6676c59327beddfbdee010d2c29f9bad3ad446a3602ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F3 10132 bytes

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