Malicious PDF — malware analysis report

Static analysis result for SHA-256 beff8dcd264de161…

MALICIOUS

PDF

53.6 KB Created: 2020-08-30 11:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de2aebf1636c5752aab52209fbb25b0 SHA-1: 3d4acc1a48137517c6ef9715d577626269db826a SHA-256: beff8dcd264de161fc0b94214db4328e6657c6050b5d44bb1c5feb39fa85c3df
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=gate%253A+weigh+anchor'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links to external PDFs, including one hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the suspicious URL and references to other PDF files, suggesting a lure or redirection mechanism.

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.cc/wix?keyword=gate%253A+weigh+anchor
    • https://static.usrfiles.com/ugd/8cbfce_a43d1bc774ea464e8477cb8c1d0f76bd.pdf
    • https://static.usrfiles.com/ugd/97634b_d1f45168a58642a6837523978047c3c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_76744fcaea7a4fc598ed8f8addaddc32.pdf
    • https://static.usrfiles.com/ugd/b8c837_03a24ae1a0444362a3d249be8f995597.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/dewedofotujobejub.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/82885678574.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3062/files/xilotedadoxajeratod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7854/0700/files/ganapati_atharvashirsha_in_marathi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7114/3078/files/17530992016.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/zedigibos.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/cheapest_android_cell_phones.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/87511531146.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e08.bin
281eb754fdc50e8422dec5135b5b846f48ea677c05a0c398f62e64e6a894cfaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E08 12996 bytes
font_01_sfnt_off00008848.bin
932f200fdc7bf6b7accf51b237720434913f4abf893f921510053678d793c331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8848 4812 bytes
font_02_sfnt_off000098a8.bin
5dfe9f9dabe754779de90cd0d7d456f396aa45ee6847fcb79240f429a2972ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A8 10108 bytes
font_03_sfnt_off0000bb57.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 4324 bytes

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