Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea97cf86bf40593…

MALICIOUS

PDF

41.8 KB Created: 2020-07-23 07:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d99fd7e22d2bb015372456b9fa8752 SHA-1: 470ed7ea4a7893d77e107f6a9cc1640bcd8b8050 SHA-256: 9ea97cf86bf40593aa984d2a66ad4c3580b3cb05b51e2fbbed1c57aebdde71fd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is `https://ttraff.cc/wb?keyword=the%20korean%20cinderella%20pdf`, which is likely used to funnel victims to further malicious content. The presence of a large number of external PDF links, many hosted on `cdn.shopify.com`, suggests an attempt to create a link farm for SEO manipulation or to obscure the true malicious destination.

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.cc/wb?keyword=the%20korean%20cinderella%20pdf
    • http://files.greenpawsvetcare.com/uploads/1/3/1/3/131383251/keviwalewixifa.pdf
    • http://files.ericgamalinda.com/uploads/1/3/0/8/130874102/635348.pdf
    • http://files.icbluestockings.org/uploads/1/3/0/7/130776712/veliwu-nunexozizosixoj.pdf
    • http://files.sailonsounds.com/uploads/1/3/1/4/131406202/koseji-fetarufonize.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/95969659775.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/28054610501.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/62819530011.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/gewolawelewodipenapodap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://movulimisulu.files.wordpress.com/2020/07/91638471660.pdf
    • https://valoranas.files.wordpress.com/2020/06/wopomimovobuloseker.pdf
    • https://zexitisi.files.wordpress.com/2020/06/fatekujamaji.pdf
    • https://vigupowiri.files.wordpress.com/2020/07/33367610545.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/nujapejakafewulaxoguvumag.pdf
    • https://cdn.shopify.com/s/files/1/0435/3415/5928/files/wuwoxewimakixeluwole.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/mepinudinutelimapenoruli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/46417195592.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/64923917748.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/monovajafasufavagometa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/wuxelovazabiparopinox.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/sikes.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_off00006761.bin
f2665941bb0e069e0153727aa408f0aeb292876e5f180c645d9b35a39c012979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6761 4788 bytes
font_01_sfnt_off0000778f.bin
592e6b797754bfe832258c8aad6391ca6ce31be78e73ee64cd90da673b108823		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10276 bytes

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