Malicious PDF — malware analysis report

Static analysis result for SHA-256 174cb51105e5fc74…

MALICIOUS

PDF

49.7 KB Created: 2020-08-25 10:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d4234425d38546e71af3c7fd07053c9 SHA-1: a3a1fb627ff133865ee1fe0b19132998a25104eb SHA-256: 174cb51105e5fc74f3f4e4f6328b21c4690c4e3d52f9d3626e4bb2659029efd7
162 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One prominent link, 'https://ttraff.ru/pify?keyword=chota+bheem+tamil+full+movie+free', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL and other PDF links, reinforcing the lure. 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.ru/pify?keyword=chota+bheem+tamil+full+movie+free
    • http://files.makeupbybb.com/uploads/1/3/1/3/131381712/zinomezumajiwet_xamaminiwoxesus_radan_gekero.pdf
    • http://muxak.megsangimino.com/uploads/1/3/0/8/130873826/091fefbdac646.pdf
    • http://files.forumartspace.com/uploads/1/3/0/7/130740213/tolanudapej_zuvojadadas_fepolumitijapi.pdf
    • http://ripuxoz.district4trials.org/uploads/1/3/2/3/132303382/wifuseramilire.pdf
    • http://files.djnancyw.com/uploads/1/3/0/9/130969851/nikowikedobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/xuxejawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/argos_catalogue_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0462/7808/2720/files/copy_paper_5000_sheets_canada.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/21433504952.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7637/files/mortal_kombat_snes_controls.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/performance_appraisal_biases.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/61460882217.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/how_to_write_an_undergraduate_cv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/standar_isi_biologi_sma_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/vepuxinebijune.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c4.bin
310bdd79d716680e0d8daf58084561977dd855afc0cd2fca239f1765c13f5d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 2968 bytes
font_01_sfnt_off00006f57.bin
f6efa3fd1d63a8b21a6a560105998c2550ba4785dc1afe47a073dd6cdda2e8c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F57 4932 bytes
font_02_sfnt_off00008006.bin
0e9ef196bc78749b8e83cabb7fd69d6239709358b6825af01d6a62c9fdb9a755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8006 10072 bytes
font_03_sfnt_off0000a27d.bin
9c71aaea62549e89be2b80026e8552e529abc9849e27d4ac1176ef2fe88b9bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA27D 16380 bytes

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