Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26d41c88b90c70d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24ad1f5c743d6cc7234a84100ce49e5 SHA-1: d44f47e38a7609943ed62da507861c53f0b13510 SHA-256: b26d41c88b90c70d93a7db5c4d89c4f91b74b93c4cf9df96fe2b05f32d9abfa5
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, a technique often used for SEO poisoning or to obscure malicious intent. One of the extracted URLs, 'https://ttraff.cc/pify?keyword=two+airplanes+flying+together+in+formation', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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.cc/pify?keyword=two+airplanes+flying+together+in+formation
    • http://files.thelatestmews.com/uploads/1/3/0/7/130738823/8848c863d3d.pdf
    • http://files.prescottvalleylittleleague.com/uploads/1/3/0/8/130813888/jobozopogo-buxufiwaj-xuxodowa-dawafasa.pdf
    • http://files.eldercaringcoordinationfl.org/uploads/1/3/0/7/130740513/jivilaki.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/70355798415.pdf
    • https://cdn.shopify.com/s/files/1/0434/2752/8861/files/fusionner_2_a4_en_1_a3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/rulobarikomadelijabifopef.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/wii_iso_direct_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/fijevedubananunar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/zedalemubenume.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/luwadazopaposufu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3340/9174/files/artioscad_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/57613211168.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_off000062d1.bin
6dcce30531770ade1c796fcabdfcd17e08797d7ee462eba896bb2621d86328c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D1 5456 bytes
font_01_sfnt_off0000754b.bin
a50e7a0bf1491d270a785fc2ef65309df2dea629ffc30c29ccdf24d7dad76e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 9848 bytes

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