Malicious PDF — malware analysis report

Static analysis result for SHA-256 be37e34e2b51db62…

MALICIOUS

PDF

40.0 KB Created: 2020-08-11 18:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba68f0d1a091f490316cab8ff12302d SHA-1: 2b06e8f94e61ad0e47986262fc4ee52d16fba0ba SHA-256: be37e34e2b51db620da7ca7663a091d02654a7cc56c996c6a7c8ffd4ba02277c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a textbook, likely a lure. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is used to funnel victims to further malicious content.

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=voyages+in+english+grade+5+textbook+pdf
    • http://jupifi.islandbeautyportland.com/uploads/1/3/0/8/130813528/f772183c4db6e.pdf
    • http://files.mrcanale.com/uploads/1/3/0/9/130969474/xakoni-tubuje-galelenijuma.pdf
    • http://files.sendingthelight.org/uploads/1/3/0/8/130814208/mapovawulofixi-rubifexifuvaton-foxanipukis.pdf
    • http://savagume.azgpc.org/uploads/1/3/0/7/130776031/lofidelujif.pdf
    • http://feluk.jenn-brown.com/uploads/1/3/2/6/132681670/wuwuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/81587777703.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/coyote_meat_wow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/18187601230.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/gumolugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/99379678329.pdf
    • https://cdn.shopify.com/s/files/1/0451/0282/5625/files/itil_v3_change_management_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/anger_management_exercises_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/91734773860.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/76224537304.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/98374618451.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/chyna_queen_of_the_ring.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/17019498892.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/nokofuj.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_off00005e3c.bin
0ef2728d66d244fabe3b19d89db69413724958d83c74a2cf24c00dc855b6cfd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3C 5768 bytes
font_01_sfnt_off000071d6.bin
94edc832430d35572d11a35aebb2076ddade8fcb87edd6d771287fae75a7bb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 9440 bytes

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