Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c07b6ebaba018…

MALICIOUS

PDF

65.1 KB Created: 2020-08-04 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abed10ef6ac4b9f2cd0b5d2bcd856037 SHA-1: 98c235e1fa78c33d2886ecef211918491d2f0ae2 SHA-256: 874c07b6ebaba0188555a5fab0b5977718f91bffb6102d07ca9d93b9cbc5ef06
128 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also contains a PDF link farm heuristic, with multiple links to Shopify-hosted PDFs, one of which is the primary IOC. The document body, though heavily obfuscated, contains the same URL as the redirector link, reinforcing the lure of IELTS preparation materials. The presence of a download button heuristic further supports the social engineering aspect of this attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ielts+writing+task+2+pdf+simon
    • http://files.greenrabbitpress.com/uploads/1/3/2/3/132303245/javiwepanu_vepuzoletaro_sivit_zefemak.pdf
    • http://files.susannebrandstaetter.com/uploads/1/3/2/6/132695990/gamozin-nixomaj-papew.pdf
    • http://files.icellw.com/uploads/1/3/2/7/132740250/37c24f.pdf
    • http://files.pvvikingfootball.com/uploads/1/3/2/7/132712614/belobekuz_xamawilufovafok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/54784134255.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/waximofijefires.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/binivoxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/class_sr-_only.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/66238326712.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6929/files/82877905222.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/47281457768.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/gorabevejewafuti.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_off0000c04f.bin
8e58e97b5e982bc0158723f8d6bca68bad4b859da9b617b73670acf0bd5b7afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC04F 5588 bytes
font_01_sfnt_off0000d352.bin
89de07e6fbcfef38f778a82776c72d09be16584b02ce4a9b254b4acbb5251231
pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 10584 bytes