Malicious PDF — malware analysis report

Static analysis result for SHA-256 b322a978198dd7d2…

MALICIOUS

PDF

43.0 KB Created: 2020-07-27 02:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fd40bab17055fb15c754c3cef29dd38 SHA-1: 68d4426f9e28d5a42b78d5bdec2a9cc9112f3a59 SHA-256: b322a978198dd7d22c18854eb1ab38f1109039bc0a15f5265730a76e118190a5
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=electronic+devices+mcq+with+answers+pdf`. Another heuristic identified a mass external PDF link farm, with many links hosted on `cdn.shopify.com`. The document body, though heavily obfuscated, contains text related to "electronic devices mcq with answers pdf", suggesting a lure to attract users to download or view content, which then redirects them to malicious sites.

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.cc/pify?keyword=electronic+devices+mcq+with+answers+pdf
    • http://files.therubythroat.com/uploads/1/3/2/8/132815004/fibanapobuvidufi.pdf
    • http://files.jsphotographycapturingthemoment.com/uploads/1/3/0/7/130739621/wulifavufagonapi.pdf
    • http://files.ncrehabassociation.org/uploads/1/3/0/7/130739789/3030cf.pdf
    • http://files.therubythroat.com/uploads/1/3/2/8/132815004/fibanapobuvidufi.pd
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/rinilivodazetuxufategaji.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/62727449448.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/mamoxorokinifusotoxus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/75567085880.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/53155225316.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/60096702792.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/febupiwimukojolur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/xipom.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/fabubetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/kofom.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_off000068ec.bin
67e0149463cbb2909e3f77c1ab4817ae882cd64d122b5ede36e8e0d8e17a45f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5416 bytes
font_01_sfnt_off00007b3a.bin
b22cdd556b7b38159f6538438332a4840cee7d680d486cb6585318b38be71fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3A 10500 bytes

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