Malicious PDF — malware analysis report

Static analysis result for SHA-256 7050633bcf489e8b…

MALICIOUS

PDF

54.8 KB Created: 2020-08-29 22:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e069956acfd489e558a76a58c3f3d82 SHA-1: f928febf32ad0b8d4b2f3b3a790e1b758192ff6c SHA-256: 7050633bcf489e8bbf3abead8063b2ada2be4c2fe88516b7fe1844ed005a60bb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are part of a link farm, and one critical link points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for downloading music, which then redirects to the malicious URL. This indicates an attempt to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

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.me/wix?keyword=cocawap.com+descargar+m%25C3%25BAsica
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/cengage_physics_for_neet_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/xizokidujax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1450/files/41208318043.pdf
    • https://static.usrfiles.com/ugd/865d50_bdd16ce344294540b957236fbac01664.pdf
    • https://static.usrfiles.com/ugd/bf650e_30bbb5bb036b4a3ba89c3439e451805d.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/rameji.pdf
    • https://cdn.shopify.com/s/files/1/0462/5789/7623/files/face2face_advanced_second_edition_teachers_book.pdf
    • https://cdn.shopify.com/s/files/1/0448/7118/8642/files/apc_smart_ups_3000va_lcd_230v.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/68086471456.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/statistical_methods_by_s._p._gupta_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef49ec6bf39c4bb486bb80f5e5d64998.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dc1336726054f349b40800e96c1f49e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1184f9f3fe86435aa291defcad351a0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad66316cd118405baa24261e50173a03.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef9bff7715084d1098bf4381f9438443.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ab98.bin
213abc1cf3aa231641d956812599c73f26f21d01d06b5252e8875d5eb4b93867		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAB98 20020 bytes
font_00_sfnt_off00006648.bin
53a06a127d723d08c86d00bdf395aeffa391acb050f4a23bc33f8fc4a22431e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6648 5508 bytes
font_01_sfnt_off000078c5.bin
5b798a6ad8f4d36cdc0bf376fe272e6600237980c44c957db54e68719c19c07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C5 16484 bytes

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