Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe96e3770560df3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-20 14:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0650ca485248fb912b1f5c73cd0c2168 SHA-1: 19bfcb62d6e98675e3e41b1a241f19014e35453c SHA-256: 4fe96e3770560df3f7cb541b473c0be4888beacfb15acdb2b7cf2da44234e3a8
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=expanding+tactics+for+listening+answer+key+pdf'. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key', which is a common lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination.

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=expanding+tactics+for+listening+answer+key+pdf
    • http://files.karenlippymosaics.com/uploads/1/3/1/4/131437666/4645566.pdf
    • http://files.conancarpenter.com/uploads/1/3/0/8/130813997/luvuxubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/magobusiriwolozun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/vijalakoguxadinapusero.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/wuzunonulonofelafusofiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/ionic_bonding_practice_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/paganini_cantabile_violin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/67927232373.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/lutulubamonovedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/dujebokiwovejubuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/bekederilasesavopagibir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/ap_treasury_online_challan_form.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_off000061f5.bin
a8c330285f623a8cbd07393f3ff851b97d6103143ac092755d05f7c34557e21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F5 5604 bytes
font_01_sfnt_off0000753b.bin
971e0307f0bae51ddfb85eac2b0518fb297e6c2af35a1a960c633efe345a6e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 10472 bytes

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