Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35793e60a8030a5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 17:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ca71f932bef539fd61da5ac3892284 SHA-1: 09c20fcd77d1fb03ddeba7a6880786ac9ceef6bb SHA-256: c35793e60a8030a53047c3547fc67f1e7079e5d33ce37dde2310b74bc2fd1df5
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body also contains this URL, presented as a download for math worksheets, and a low-signal heuristic for a download button lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, some of which are benign Shopify links, but others are unknown. The primary malicious URL is used to redirect the user to potentially harmful content.

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=free+printable+math+worksheets+simplifying+fractions
    • http://files.spiritualrealmconsulting.net/uploads/1/3/1/3/131379904/ruzuxor.pdf
    • http://kozulal.nextmovementchurch.com/uploads/1/3/2/8/132815793/bafud_rejegoz_zisir_kixezijovin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/1000_most_common_adjectives_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/63026657747.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/8006353620.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8832/files/44567907680.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/rs3_farming_patches.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/poluni.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/epic_emr_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/88659820684.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/28358882007.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/lolezabepobepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/drive_script.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_off00005c33.bin
c5dbef010963e1f6bdd30d6495ef1bab6f4fd0128ba95ea9a25bbb6188ab58f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C33 5784 bytes
font_01_sfnt_off00006fcd.bin
23a5b347918cf51811d2cfe4bff8084ad92f3bb72c9eb45338812a8fd06fe4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCD 11604 bytes

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