Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a3816ce00319ac…

MALICIOUS

PDF

42.7 KB Created: 2020-08-02 22:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366376db2f959b9141cf89c04574b3b9 SHA-1: 50f5993b6fb9b02a4f8f9da19e31f964374ba8aa SHA-256: 93a3816ce00319ac61c7f032958e1ff06c390dcd33e06dfb1d0c2b6ab91c71c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which are part of a link farm designed to appear as book downloads. One of the primary links, 'https://ttraff.ru/pify?keyword=bangla+book+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating a clear intent to direct users to malicious infrastructure.

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=bangla+book+pdf
    • http://files.dolcasorbet.com/uploads/1/3/0/7/130738652/81e1c7a2a2e3e.pdf
    • http://files.theculturedmushroom.com/uploads/1/3/2/7/132710497/109cc87599b62e.pdf
    • http://files.cedarparkconcrete.org/uploads/1/3/1/4/131437601/1357074.pdf
    • http://files.zillplantas.com/uploads/1/3/1/3/131382239/lasupunamubukunal.pdf
    • http://files.thetechnicolorsheep.com/uploads/1/3/1/4/131438641/tuzutamavalogusite.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/73658231207.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/86914968919.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/zejonabodeluvozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1435/7145/files/85008645972.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/54216875904.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/lotapilelefadikovigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/16063784512.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/vuwos.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0901/files/vasis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/41070924258.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_off00004dfc.bin
f20878d0dabeb5e65d28e3030b1ea75986d25d62fcd67c3b268bf1d3bff64e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFC 5188 bytes
font_01_sfnt_off00005fb9.bin
27b0651eaddad81053ebbb1e5d936b4ee35b527209cc18884de1ec9a4c88cdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 8664 bytes
font_02_sfnt_off00007b7c.bin
fa1e7f6030f18ad0ebe02d9ef01158dc3a130e991e81892dfa2b2e7d17e123d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 10092 bytes

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