Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eeda132ab6dc88…

MALICIOUS

PDF

44.1 KB Created: 2020-08-22 12:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46f9acb09ade46ab2f94b2d0c51f1370 SHA-1: f2572866c1aa6c08b70cf01142e67ce12eec039d SHA-256: 87eeda132ab6dc889296d8fdfc82daa6d7a2ce713d7a9d81f44949e179912bd4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'gcse biology classification worksheet' and a URL pointing to a redirector. This suggests a social engineering attempt to trick the user into clicking the malicious link, likely leading to further malware download or phishing. The presence of numerous links, many hosted on Shopify, indicates a link farm strategy to obscure the true malicious destination.

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.ru/pify?keyword=gcse+biology+classification+worksheet
    • http://files.marylandmonarchconservation.org/uploads/1/3/1/6/131607047/zodusot.pdf
    • http://files.gabcmemphis.org/uploads/1/3/2/6/132682990/9079200.pdf
    • http://jubukexu.gracebecker.org/uploads/1/3/2/6/132683138/3248077.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/tikijivasidamegulip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/ms_aphasia_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/60835318635.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/50702060061.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/65585899054.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/45730992965.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/22873166742.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/550558208.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/nys_form_nf-_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xasaxikopakepiditewevumub.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/53258344379.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005927.bin
c1bcb393469dfe6e0223355885299c30fde3415c87d7200cc4ac740df08659bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5927 5572 bytes
font_01_sfnt_off00006c2a.bin
7e55b4b22bf86b3617eb3039a9d06d88c41a37faaf944979921e344303837af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2A 9948 bytes
font_02_sfnt_off00008e6c.bin
7ccd8150e2c48a9748994740f2a0713563e2bc66516285f786c138bc0577823a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6C 16088 bytes

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