Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d817adf03c2feb…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 13:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9f748160f86ba580890ef4afa4871d5 SHA-1: 037b9adfc468e82c69adc562f2a9174284189661 SHA-256: 55d817adf03c2febedcc940c4d1f8c98b8f52b671d2ef56000fd5c6a80a91698
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure ('Draft answer key meaning') and the malicious URL. The presence of a mass external PDF link farm further indicates a malicious intent to distribute 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.ru/pify?keyword=draft+answer+key+meaning
    • http://files.beautybehindbars.org/uploads/1/3/2/6/132695194/tejonetadatosa_luwek_safukiselow.pdf
    • http://files.misswcourtroom.com/uploads/1/3/1/0/131071252/1590104.pdf
    • http://sugawada.jblaw.ca/uploads/1/3/1/6/131606490/0421faa0f85c06.pdf
    • http://files.bellamedaesthetics.com/uploads/1/3/2/7/132712514/f98663.pdf
    • http://files.beetlenation.net/uploads/1/3/1/4/131437699/6704816.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/amado_mio_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/77804599724.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/31095479988.pdf
    • https://cdn.shopify.com/s/files/1/0437/4704/9623/files/carbon_footprint_file.pdf
    • https://cdn.shopify.com/s/files/1/0437/3138/6517/files/practical_management_science_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4962/2431/files/zilebuwejosugu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/adobe_reader_download_gezginler.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/88041241322.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_off00006491.bin
d8dab5491a5f85e863df966e6e18b143c57e68cebbc8556eca13ba0867a076e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5312 bytes
font_01_sfnt_off000076aa.bin
b3c1ac2c1ef761467af2139aad6adebae591faf7b29b81bc0cebe8a6959afd47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AA 15368 bytes

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