Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8862272fff88a77…

MALICIOUS

PDF

40.5 KB Created: 2020-08-24 07:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074bb21e3650344267e8a978f2955e4d SHA-1: 271f98a1f4f31728120a400ba847865d31b2fa8a SHA-256: c8862272fff88a773578be3c21b5efc535adb73eebae2cd9e6195e61328b6d45
150 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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to PDFs hosted on Shopify. The document body, though partially corrupted, contains the string 'Opposite adjectives esl worksheet', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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=opposite+adjectives+esl+worksheet
    • http://nigupop.bryanmierauphotography.com/uploads/1/3/1/4/131482853/892491.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/2042413187.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/sepolidigudanixerisewado.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/88252951383.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/vascular_surgery_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3937/2965/files/mofovotuzitapatizir.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/96792295945.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/64651706659.pdf
    • https://cdn.shopify.com/s/files/1/0434/2258/0886/files/parasonowepuk.pdf
    • https://cdn.shopify.com/s/files/1/0454/6310/9790/files/sifob.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_off0000603f.bin
4784ed2e9583bc48d986b776daec9d6ce90074f6d2683058a4059a8a69291196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603F 5480 bytes
font_01_sfnt_off000072ea.bin
16cf6bfea86e1ef82778ab3e73bf5b026c52baae9d8e83ba4970d26e40701da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 10180 bytes

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