Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b8757e32fe8970…

MALICIOUS

PDF

46.1 KB Created: 2020-08-23 16:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 296d13fa79885226da5036a1d2ea7a81 SHA-1: 5a4fc19e16b49c67a9c17674ae282dad7431524d SHA-256: 19b8757e32fe897002feeff56691315767a5172020af4a7f2cd0b5824e5df9d7
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ttraff.cc). The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser extension or update, a common social-engineering tactic. The presence of many external PDF links suggests an attempt to generate traffic or SEO manipulation, potentially masking the malicious intent of the primary link.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=bubble+sort+flowchart
    • http://files.liseofires.com/uploads/1/3/1/4/131437341/mideturuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/adobe_flash_player_chrome_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/strategyzer_ad-_lib_value_proposition_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/vusirulut.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/aluminum_alloys_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/9993/1295/files/nukumorexekejuxuzu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/kjv_bible_study_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7957/files/asymptomatic_bacteriuria_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/57446234248.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/wosifilidoduda.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/bombay_jayashree_tamil_songs_starmusiq.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/apple_composite_av_cable.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d9b.bin
96b88ca9e5c4b655e2f6db3f4f26cd8853e841fce1b9ae6f03cc59642582a235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9B 5248 bytes
font_01_sfnt_off00007f7f.bin
b48175747ea3d6dfb0d48abbd774f3fe47b999f9cf83a1660f6f1effc8146b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7F 14200 bytes

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