Malicious PDF — malware analysis report

Static analysis result for SHA-256 4411a83860a9971d…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 12:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf3f128970069fa18c8caa350bf18c6 SHA-1: 205edab19cc5cf95957b098af0e95eec4892cc14 SHA-256: 4411a83860a9971db0cc0e0576f36f0e033dffbf299f2781f0a919ad6bf54993
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm, with one prominent link leading to a known malicious redirector. The document body and metadata suggest it is a lure for a book download, but the embedded links are designed to redirect the user to malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=fish+in+a+tree+full+book+free
    • https://static.usrfiles.com/ugd/80bfa9_94c1a8bf932844b79379a9355c95dfce.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fbe7438b0204febb7cdcfe7cc1f4c31.pdf
    • https://static.usrfiles.com/ugd/b8c837_28acea3de6f24adc96ab9e276cec3be0.pdf
    • https://cdn.shopify.com/s/files/1/0437/2814/2501/files/bhaiya_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/busivizekogisifavofo.pdf
    • https://cdn.shopify.com/s/files/1/0447/1826/0377/files/socket_io_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/63956824303.pdf
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/52673478188.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/16331528797.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/activate_windows_10_kmspico.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1691/files/sf_jury_duty_reporting_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/pdf_to_word_converter_free_download_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/cartoon_photo_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/indonesia_vpn_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/learn_bosnian_language.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_off000079ee.bin
02581e6b993a64461784c2121b076574f7c0a530ab898cf0b4dac4b60c690cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 4896 bytes
font_01_sfnt_off00008a7c.bin
010696157c0f26998c9512dab735c2f032db5d642ba607d2bb02a65e1a639f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7C 10172 bytes
font_02_sfnt_off0000ad5b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5B 4324 bytes

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