Malicious PDF — malware analysis report

Static analysis result for SHA-256 7705c965b56f38a0…

MALICIOUS

PDF

42.7 KB Created: 2020-07-13 20:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a818483a430346462f9898c32d3d1b1d SHA-1: 1deadbfd31a85cbde8bb8544509ba0fd6a8c6d4b SHA-256: 7705c965b56f38a0dcecb73ae33960a8ed2c542865e97ca2e6783f0fa6df122e
162 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its use of a link farm and redirection to known malicious infrastructure. The document's content and embedded links suggest a phishing attempt to trick users into downloading potentially harmful files. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious download lure.

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.cc/pify?keyword=exam+master+september+2020+pdf+download
    • http://files.karrathacaravanpark.com.au/uploads/1/3/0/8/130874501/c367936f4.pdf
    • http://files.charityforchildren.ca/uploads/1/3/2/8/132815385/1a6279.pdf
    • http://files.tylerhampong.com/uploads/1/3/1/6/131606454/wizowawas-dosogik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tapaxumenu.files.wordpress.com/2020/06/64580069202.pdf
    • https://bejeriwojaf.files.wordpress.com/2020/07/rizuvigebipamuxebep.pdf
    • https://xaradobipiz.files.wordpress.com/2020/07/sefujijokiwejarilaxapudam.pdf
    • https://vuxiluxuda.files.wordpress.com/2020/07/23253358749.pdf
    • https://vasotox.files.wordpress.com/2020/07/54719300633.pdf
    • https://safowazebafo.files.wordpress.com/2020/06/2368667444.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/337866912.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/zuzonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/zinulir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/12692698302.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/vutebubasipit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/ramamoletozebulifada.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/zatebusepusugamoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/govilasovuvizi.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_off0000690b.bin
c99149ed805088fa35f60375a0944db2a67784b516f31d3ed9e5cf5f111a5bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 5460 bytes
font_01_sfnt_off00007b93.bin
2f03741a5cefb60f27fc6c250e5c2895ed09ee55d0365b6922678708dd42bdbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B93 9896 bytes

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