Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5f28e0dbd111c9…

MALICIOUS

PDF

56.4 KB Created: 2020-08-09 19:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a9b4d25562757425c30ac3851b1cb8 SHA-1: e0813a104277faee02c812baf1bad6d10757e461 SHA-256: 0b5f28e0dbd111c9bcd70bfb9985fcff5d877fa4cb0d8da94dd14f4b9251e5ff
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, including one identified as a malicious redirector, and employs social engineering tactics by luring users with a fake download button and a browser extension installation pretext. The document body, though heavily obfuscated, contains references to 'Adobe Acrobat PDF Editor free download software' and includes the malicious redirector URL, strongly suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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.cc/pify?keyword=adobe+acrobat+pdf+editor+free+download+software
    • http://files.twochicksandabar.com/uploads/1/3/1/4/131452840/dajanokidukijerufik.pdf
    • http://gosotaj.prhsboyssoccer.com/uploads/1/3/0/8/130813528/diduxewetuwisisurisa.pdf
    • http://xubabe.bribiepassagekiosk.com/uploads/1/3/1/4/131452977/nutujanixed.pdf
    • http://falozukex.whidbeyworkingartists.com/uploads/1/3/1/3/131380213/8a0e75a0de97e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9654/6216/files/36189011951.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/bixofiwesiri.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/gafipepiralewijame.pdf
    • https://cdn.shopify.com/s/files/1/0431/0650/0769/files/ecological_systems_theory_bronfenbrenner.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/ublock_origin_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/40068703505.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/34727945748.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/wunijevinuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58657968950.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/86382060274.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/2594724824.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_off000072ab.bin
c7811c6632dd50a776c8d491833c01d677c9cb717ddc2a53d264d4ae5b635fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AB 5236 bytes
font_01_sfnt_off00008516.bin
0c76d7f81c51c2d7adf54ec136474478201053315b19ef892bfcc8d4fe62f829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8516 5372 bytes
font_02_sfnt_off00009777.bin
66f78ce8a607c2cd5374b3b18adea69900444300a0dda7e5609bd2a10149624d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9777 10752 bytes
font_03_sfnt_off0000bc84.bin
d6cec5d81403a3d70faea1540ef19555465bc704c2477342a2b01c02bc8a8e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16488 bytes

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