Malicious PDF — malware analysis report

Static analysis result for SHA-256 776e1fe37f4978eb…

MALICIOUS

PDF

44.8 KB Created: 2020-07-12 01:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a33a2b69bbc72ddd317f04bc06ec4a39 SHA-1: cb0c8d202bb0cc9dbf232805786fc224f696ba50 SHA-256: 776e1fe37f4978ebd7b53b93822ea0b8bc66edd5cc02bceb922b4fa17286d61b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/wb?keyword=how%20to%20convert%20pdf%20to%20ppt%20without%20software', is the primary indicator of malicious intent. The document also exhibits characteristics of a PDF link farm, suggesting an attempt to manipulate search engine results or distribute links to various resources, some of which are malicious. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=how%20to%20convert%20pdf%20to%20ppt%20without%20software
    • http://files.emotorcontrol.com/uploads/1/3/0/7/130775497/topepevevolom-fotime-jinejafume.pdf
    • http://files.updatescentral.com/uploads/1/3/1/3/131384018/fotimiva_nidanu_gibuvidedavade.pdf
    • http://files.simonikigweba.com/uploads/1/3/1/3/131398177/wagekakapuzowi.pdf
    • http://files.ridgeclinicairliebeach.com/uploads/1/3/1/8/131871778/8776139.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/62559088644.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tutokufumetuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://vijebuxiz.files.wordpress.com/2020/06/22479748386.pdf
    • https://savosamozam994990971.files.wordpress.com/2020/07/butuzo.pdf
    • https://wexozixa.files.wordpress.com/2020/06/xekikafenaro.pdf
    • https://xebekuno.files.wordpress.com/2020/07/bebuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7154/files/kufimedujukesi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/resar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/50131784705.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/29539243350.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/lakavamimuraronuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/puvim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/2409248578.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.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_off00007244.bin
4315bc52bd4c944801d0f5fc022489671fcde5cabf4b40e9dfb7eaa083106dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7244 5204 bytes
font_01_sfnt_off000083fc.bin
17b4881b2984bf8e188ae84eace4e2429604287c39c781185f7682a3104aedae
pdf-font-stream PDF embedded font (sfnt) at offset 0x83FC 9960 bytes