Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5065d4733263928…

MALICIOUS

PDF

44.9 KB Created: 2020-08-04 11:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7365492ad74e36b826c5684ad63f7b8 SHA-1: 5b6f25d845ce3fef466444b94936e632d4e79a18 SHA-256: d5065d47332639280e1cf137f5e9669ae5ad47cffb4553213da5543c79bf9cac
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to "Malaria treatment guidelines 2020 pdf". The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The file is generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=malaria+treatment+guidelines+2020+pdf
    • http://files.paulinspx.com/uploads/1/3/0/7/130739971/vupepo-gudare-felalixof-ralerosaz.pdf
    • http://files.1divashop.com/uploads/1/3/0/8/130814172/4832978.pdf
    • http://files.showjumps4sale.com/uploads/1/3/0/7/130740571/8558149.pdf
    • http://files.magicstorybooks.com/uploads/1/3/1/4/131406662/8721599.pdf
    • http://files.eastcoastceramics.com/uploads/1/3/2/3/132302766/kemeritirilukako.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67257536452.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/vipatodutos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/serananovuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/43081215173.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/30487290835.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/garejanewavetujarasako.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/78291535854.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/pmbok_latest_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/56216635215.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_off000061c7.bin
5a6f923ddf39250c33535b5e76c12cea0345cb3a6132231e5a2abfb2f8ff948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C7 5412 bytes
font_01_sfnt_off00007417.bin
e2119d727f099a62a67e2bbe7891321aab523d19d7ac2febb9e343c4f2c10cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 10792 bytes
font_02_sfnt_off00009898.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9898 4324 bytes

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