Malicious PDF — malware analysis report

Static analysis result for SHA-256 077d195cf7a9d65e…

MALICIOUS

PDF

50.7 KB Created: 2020-09-06 20:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5208a185542b99fa2b0c086a900f6d9d SHA-1: 2ebc1bee0cfadc35df86f09d1754c5b0a29cbf68 SHA-256: 077d195cf7a9d65eeae1c1468d4263f906b818bdd156cb977220340f85dbde3f
162 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, masquerading as a download for software. This is further supported by heuristics indicating the PDF links to known malicious redirector infrastructure and a link farm. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=borland+c+compiler+free++64+bit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/oceanofpdf_similar_websites.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/lewis_dot_diagrams_worksheet_answers_instructional_fair.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/hindi_party_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/cipherlab_rs31_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/nsfw_discord_rooms.pdf
    • https://cdn.shopify.com/s/files/1/0432/8384/1190/files/62674759347.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/9756786746.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/81601948911.pdf
    • https://cdn.shopify.com/s/files/1/0438/4263/3890/files/aisatsana_aphex_twin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6565/files/bell_bottom_2019_kannada_movie.pdf
    • https://static.usrfiles.com/ugd/82e28d_7086e12ddabc472992d56fd7e9f0d16a.pdf
    • https://static.usrfiles.com/ugd/0a51c1_47d0de2abcbb41b9baf7dc4715ef5a92.pdf
    • https://static.usrfiles.com/ugd/c3f59f_dac552e1e90940b7a71bd56e651e5a9b.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_57533a6fd53445eca7577cb78bbc853c.pdf
    • https://static.usrfiles.com/ugd/696b8a_7ef100f6734644a28392ee8c60e95d62.pdf
    • https://static.usrfiles.com/ugd/ab5adf_aa08ea4b8247449ba9c770241127c64b.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_off0000701f.bin
5a243208b4b09e4bcf116e4d99a455ee42bd451b84a8d74633c05ee622d76071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701F 5340 bytes
font_01_sfnt_off00008229.bin
877dae9c0c8af131654daf65607db14ec5535798b99f67d350d130f7e3278c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 14740 bytes
font_02_sfnt_off0000b008.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB008 4324 bytes

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