Malicious PDF — malware analysis report

Static analysis result for SHA-256 8932a7002c858ae0…

MALICIOUS

PDF

132.7 KB Created: 2020-08-02 17:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f396ca557f19cd9462add92ce94a535 SHA-1: e6673a63dabb04d5e8c6a7ccba58462fe712db73 SHA-256: 8932a7002c858ae0c069d96d394e975b18d095f57da7990bd9c04d6ce13ad685
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'basic engineering circuit analysis pdf'. The presence of numerous external PDF links also suggests a link farm for SEO manipulation, likely to obscure the malicious redirector. No scripts were extracted, but the primary attack vector is the malicious redirection.

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.com/pify?keyword=basic+engineering+circuit+analysis+pdf In PDF document text
    • http://files.nmtiasf.com/uploads/1/3/1/4/131407051/xetomekukuw.pdfIn PDF document text
    • http://files.atomicgolf.club/uploads/1/3/1/4/131406659/xanevevixas_kefivadipe.pdfIn PDF document text
    • http://files.tufproject.org/uploads/1/3/1/4/131437044/7955795.pdfIn PDF document text
    • http://www.simpopdf.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/bogekewojizitam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jujirufevob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4024/9755/files/50063577623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/96609341960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/nawijez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/bolens_lawn_mower_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/76958420672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/losarame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/lumevixifaxazowagajo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF61 5476 bytes
SHA-256: 557c50f52852ec9462010cd5bbabd77ba3a67144f2aea2a11deee8bdf062a50c
font_01_sfnt_off0001d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D21C 16236 bytes
SHA-256: fc8222339b6035a71d48651eba92c895c07aab247ed7c66f30249eee8fbda38f

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