Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd99add7083d9a…

MALICIOUS

PDF

50.2 KB Created: 2020-08-25 08:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b5ac2ec8d865d177190ff72d500d3e SHA-1: 00212980b1eb36c3791110d0b8779a00fe451f4d SHA-256: 67dd99add7083d9a02bbc1d31a9eeec19268c87d2c79a0cc0495c5ebb917b3ea
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=link+video+er+app'. It also exhibits a link farm pattern with numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a list of Shopify URLs, suggesting a lure to external content. The presence of a remote-support tool lure heuristic indicates a potential pretext for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/pify?keyword=link+video+er+app
    • http://files.plantandsoiltreatment.com/uploads/1/3/2/8/132814977/4450891.pdf
    • http://sesaxig.melissasterry.net/uploads/1/3/1/4/131482952/5624286.pdf
    • http://ratawopo.marcelwesdorp.nl/uploads/1/3/1/4/131482952/sinujipoxamew_divupuzabike_jivewused.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/essential_grammar_in_use_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/karya_ilmiah_tentang_bahaya_merokok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/mobile_bookkeeping_app_ing.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/xefaxatonezetuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0870/files/madotut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/demand_definition_economics.pdf
    • https://cdn.shopify.com/s/files/1/0438/3372/0992/files/bollywood_movie_hd_print.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3901/files/96613182162.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/baberelumotut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/kabamutibadudafof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/jinusonit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ordinal_numbers_exercises_elementary.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b4f.bin
82dd2dd467e667da965f82bc62f5ca13027db9c4f5d2db79be2175d9952282d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4F 4516 bytes
font_01_sfnt_off00008aa5.bin
995f465b7a1a5994934211a9b125db821052e44ab6a348b6b522a6b3da1b3f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 10316 bytes
font_02_sfnt_off0000ae06.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 4324 bytes

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