Malicious PDF — malware analysis report

Static analysis result for SHA-256 791838a92b83691c…

MALICIOUS

PDF

48.7 KB Created: 2020-08-05 13:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451364c374aff4d23fbb623da43cbced SHA-1: 73d53dd67cd6c9bbb97a93a8344e1c3264823eb7 SHA-256: 791838a92b83691c7932dd4cec6d0d0098c883a16f100cca825953ae3a9e99ca
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The presence of a 'download button' lure suggests a phishing or social engineering attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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=applied+multivariate+methods+for+data+analysis+johnson+pdf
    • http://files.stewartsrestoration.com/uploads/1/3/2/6/132682040/7247866.pdf
    • http://files.wales-on-wheels.com/uploads/1/3/0/9/130969191/2613727.pdf
    • http://files.ronnieroseband.com/uploads/1/3/1/1/131163986/7956122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/fulolilezepuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/legibuwivob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6041/files/51331000980.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/58769949860.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/wifedodikusibamudaxoliwod.pdf
    • https://cdn.shopify.com/s/files/1/0441/1061/0584/files/miwozepusibebemenoju.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/zinorumijopavagutunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/96075796388.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/download_materi_akuntansi_keuangan_lanjutan_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/zidinid.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/sorudovedotubip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/birimot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/zejujin.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_off00008093.bin
3c305d6f28e3500dae4f229355d58bc1015e7b7d41091ddc884c1622b9ea270c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8093 5508 bytes
font_01_sfnt_off0000933a.bin
183620429cef91993df7fb51b197d9ef90fbb68d2ccee285d9a75cece7efc289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x933A 9836 bytes

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