Malicious PDF — malware analysis report

Static analysis result for SHA-256 5132375f74e41bcc…

MALICIOUS

PDF

54.6 KB Created: 2020-08-22 22:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72835d034a0f575c599a9a60f52019fc SHA-1: eb2d016780a2202e052ca6feac181cece77dd2f1 SHA-256: 5132375f74e41bcca41cbe0b6113aade74d3648f5d1dab199b5ca5bd23797512
120 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to Shopify domains hosting benign PDFs, but one critical link redirects to `ttraff.com`. This redirector is associated with malicious activity. The document body, though heavily obfuscated, contains the text 'Biophysics book free pdf' and the malicious URL, suggesting a lure for users seeking free content. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the redirector.

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=biophysics+book+free++pdf
    • http://files.canineandequineranch.org/uploads/1/3/0/8/130813458/548cd8167a6.pdf
    • http://xulup.1corinthiens15.com/uploads/1/3/0/8/130874113/lokuzanosafajovowok.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/complications_of_general_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7445/files/99391040582.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/69199890557.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/35408821331.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0450/8313/2056/files/react_native_cache.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/haematology_textbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/83221777645.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6183/files/81592802393.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_off00008c14.bin
aeb64b57ef00a3843a672ef245b152360c65a160d804f5db5859e8cc50745a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C14 4960 bytes
font_01_sfnt_off00009d00.bin
c1d6d7fb0ab8300a165ca8e82b3623cf91308689aaadcc598a3274a5ce913673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D00 10140 bytes
font_02_sfnt_off0000bf7b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 4324 bytes

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