Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db948711b95a89d…

MALICIOUS

PDF

45.0 KB Created: 2020-08-04 03:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310d91b09d6cf0bccdfe58fa70229c20 SHA-1: 81288ff56e1df06dd1bdefd40ea98790671253b9 SHA-256: 4db948711b95a89d39ba669503c2b3fda3da227a6fe47d4b73714246cffdbb1f
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=r%25C3%25A9gulation+du+m%25C3%25A9tabolisme+des+prot%25C3%25A9ines+pdf
    • http://files.relationshipsuccesscoach.com/uploads/1/3/1/4/131408913/4604422.pdf
    • http://retiro.moannasworkroom.com/uploads/1/3/0/9/130969356/3952559.pdf
    • http://tupug.danielbuchanan.net/uploads/1/3/1/4/131453555/pikujaripen.pdf
    • http://files.mypropertyquestion.com/uploads/1/3/0/8/130813592/lagufun.pdf
    • http://files.fx-toprebates.com/uploads/1/3/0/8/130813796/dalozadose.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/pukozijuwofo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/ac_pressure_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/cycle_of_abuse_domestic_violence.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/97209359044.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/boxemoduzerovanifipefuxig.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/gokepitoguzipugubixunepo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/netituwawi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/65509605401.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/92830618625.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/53543177904.pdf
    • https://cdn.shopify.com/s/files/1/0437/0294/3909/files/dabukoke.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/6953024626.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/2321365796.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_off00006da6.bin
0988c490b01381010f78bdc2b1a26036a43e1113755f528d1ac8a1c512dc62d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 5648 bytes
font_01_sfnt_off00008081.bin
2fd024e48a8706bcc7bc9c1d9b8e7d48a217ce1e4df6edf36f2884cf2189fc7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8081 11504 bytes

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