Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e579edea89d9e6…

MALICIOUS

PDF

40.1 KB Created: 2020-08-08 10:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb063b1e0616633181674cb81bdf6ca SHA-1: c9e83c7e9302b17e4e962540949d76eae31b679e SHA-256: 55e579edea89d9e605f8ff30480e4e2f8d8776016d0f2c1a1c0aec94ae60533f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, a technique often used in SEO link farms to manipulate search engine rankings. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a book title and the URL that triggered the malicious redirector heuristic, suggesting a lure to download content that ultimately leads to malicious sites.

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=operatoria+dental+barrancos+5ta+edicion+pdf+descargar
    • http://difuwelov.lcsthirdgrade.com/uploads/1/3/1/8/131856158/f1d68998cfb6cc9.pdf
    • http://files.healingmediallc.com/uploads/1/3/2/6/132680808/gelipagakalexut.pdf
    • http://files.uptonwarrencanoeclub.co.uk/uploads/1/3/1/3/131380354/4522792.pdf
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/zedesepu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/rogerexibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/swellinfo_long_beach_ny.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/holy_books_of_hinduism.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/relexibag.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/galujukekujisosasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/sedon.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/14515910232.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/51195144350.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/57928596761.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/56685298496.pdf
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/kapad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/47046172746.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_off00005d63.bin
b45606595c030b69db83139b9890e03d684283c1ece3c4084614250b60f5374c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D63 5612 bytes
font_01_sfnt_off00007080.bin
47623326660619a8c91d286087020aa80d0692343dcd61edf27197a3ce7e2ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7080 10116 bytes

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