Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3da5c5e110a7c84…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b336659a855d990dd7338a99c86d21 SHA-1: f1eafd07a539487ad63c9a17df218deeb274ba3b SHA-256: b3da5c5e110a7c84805d7a8f399977e1162819d119a4f528d64d05f087bad072
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'esl direct indirect questions worksheets' and includes the malicious URL. This suggests a phishing or scam attempt to redirect users to harmful content. No scripts were extracted from this sample.

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/pify?keyword=esl+direct+indirect+questions+worksheets
    • http://kiwerefuz.electricstormecigs.com/uploads/1/3/0/7/130738720/kikurilo_watinagodugowo.pdf
    • http://files.geo-mac.com/uploads/1/3/2/6/132681307/3696041.pdf
    • http://files.nancyribi.ch/uploads/1/3/1/1/131164460/doxogive.pdf
    • http://wexata.oligumm.com/uploads/1/3/0/9/130969723/butolebum_pideg_dafos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/57550721362.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/58000677757.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/adriana_lecouvreur_libretto.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/57104990784.pdf
    • https://cdn.shopify.com/s/files/1/0433/0340/3678/files/72567729661.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/muponivopexaze.pdf
    • https://cdn.shopify.com/s/files/1/0448/7512/0807/files/arm_microcontroller_programming_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0448/9897/5899/files/list_of_journal_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/32348470431.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0116/files/witonuxu.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3998/files/fovifufenijipenuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/momo_michael_ende.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/rowikekixaxuzujovudenuwe.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_off00005c97.bin
246e7982115db31ab4c8158843864d2b20475f3a228f29899dd4a0b6cc152d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C97 5056 bytes
font_01_sfnt_off00006dd0.bin
4b87c831a19c22be3d9d3f956fdac0e6ed99766dd56f7006f04808f329ed7226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD0 10768 bytes

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