Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a98b289885d6ad…

MALICIOUS

PDF

67.0 KB Created: 2020-08-14 04:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfdbf1adbbd08103bc20521b22874c01 SHA-1: 8802d5a49ac9e33c59e16714892e9a918b544b6c SHA-256: f7a98b289885d6ad8209a2035deb45861701b9eda1c9ef7cf37c2b4586e50db9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search results or distribute malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused for malicious purposes.

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/wb?keyword=mismatch%20repair%20mechanism%20pdf
    • http://maxuguv.herbfire.com/uploads/1/3/1/6/131637814/cc84c098.pdf
    • http://files.katiethompsonestatevineyard.com/uploads/1/3/2/7/132740237/5802dc975.pdf
    • http://files.easttexasplacenta.com/uploads/1/3/1/3/131384071/tefurukelinav.pdf
    • http://silojetod.flewthecoop.net/uploads/1/3/0/7/130739564/ed621.pdf
    • http://xofase.laurencesullivan.co.uk/uploads/1/3/2/7/132710712/6429596.pdf
    • http://files.katiet
    • https://cdn.shopify.com/s/files/1/0430/4322/5751/files/18916205682.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/51252972270.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/kusebezaxikefevawes.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/11th_grade_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/clear_variables_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72619586694.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/83012568023.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/ardour_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/tikaxatikatepiropo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/18148660715.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/british_pronunciation_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6774/files/the_arrangement.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/bring_up_genius_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/42283019947.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_off0000b853.bin
77f1aaafe715b6929930e611415948e7fc86d199633296a21453e92c5dfa7b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB853 5048 bytes
font_01_sfnt_off0000c94c.bin
4f9bb4c7b2ce8b2b6cb2d423ee6ebb5380e681a1c4ff46b50465f5914e005f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 12148 bytes
font_02_sfnt_off0000f057.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.