Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed31377d554cfbd…

MALICIOUS

PDF

52.4 KB Created: 2020-08-07 09:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5230041ff6f56f27e86eb4a3d7835b8f SHA-1: b0e03dde73f4e3e2c0a343e6d04c9090359b6c07 SHA-256: 6ed31377d554cfbde5b3246041bf07eeddc92ff37967a3c632d9fe214c4f5319
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, "https://ttraff.com/pify?keyword=national+antibiotic+guidelines+2020+pdf+doh", is flagged as a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains references to this malicious URL and other PDF links, reinforcing the lure. No scripts were extracted, but the presence of malicious redirectors and a large number of external links strongly suggests a phishing or malicious redirection attack.

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.com/pify?keyword=national+antibiotic+guidelines+2020+pdf+doh
    • http://xajigova.hoggardstudentservices.com/uploads/1/3/1/6/131636664/jiwiwomevu.pdf
    • http://files.yauponberrypress.com/uploads/1/3/0/9/130969368/e91cbf41d.pdf
    • http://files.dsldaquascapes.com/uploads/1/3/1/8/131856498/6967434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jebedepesedutorerivaraf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/xobowevaloboleri.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/4980340072.pdf
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/30604025245.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/3845368248.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/64352637984.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/30313671617.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/23915643371.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/easy_steps_to_bossa_nova_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/spektrum_dx6i_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/mathematics_worksheets_for_class_1.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083a9.bin
d38efe54d464821fe1f711f2c529d4140d05ad6160f7040684e0724ee6f97a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 5704 bytes
font_01_sfnt_off00009713.bin
84b7a3cebc178e8a09cdc2d81726e54eb3cb919d46fc097d0a31cbb994cfe8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9713 14436 bytes

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