Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb288a844dddbb0…

MALICIOUS

PDF

42.9 KB Created: 2020-08-17 17:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26b194bac4165addf26e94191dfda52 SHA-1: a75a2aa8ea9ffcced790d790125917134f203a26 SHA-256: 9fb288a844dddbb0566caa73aa31c024f1dc0a60cc85ceff7fc157fe716c6efc
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised with a seemingly innocuous title related to academic formatting. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a larger scheme to generate traffic through numerous external links, likely for SEO manipulation or to distribute further malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=anova+table+apa+format+examples
    • http://files.tutorvirginia.com/uploads/1/3/1/8/131871907/4529634.pdf
    • http://naluveto.isabellawtw.com/uploads/1/3/1/4/131455463/4775031.pdf
    • http://files.chrysm.org/uploads/1/3/1/3/131383737/zekewonevanexir-nutakamuz-wemozuza.pdf
    • http://files.theaterinthepark.net/uploads/1/3/1/8/131871501/8677951.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/wonawuforanir.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/24628749163.pdf
    • https://cdn.shopify.com/s/files/1/0435/7718/0328/files/logic_gate_project_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/ripibefopadefabumumitevov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/59837156086.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/repixasisusinerowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/axolotl_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4573/files/fivir.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/nomufijabodixekugitofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.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_off00006926.bin
2f515a4f7c1793bff12b06d6d0ce30a235e767a001c428dce9a67ce72fdc209f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6926 5304 bytes
font_01_sfnt_off00007b24.bin
88aa9f21df7891f62185b0d0bd13aa50d0c03732c5ab29ee6379650f998d8d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 10404 bytes

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