Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9330ceb681d9d6…

MALICIOUS

PDF

51.1 KB Created: 2020-08-19 09:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6468befcae8f6141fa92690496aa005 SHA-1: ef0c0b2a9b49ebc8d29ed7847dc213eadd7d40e8 SHA-256: 7f9330ceb681d9d6e119c27dbe8c39dde494f6426078650e133cfaf3ae5c91a4
162 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, contains text related to business English exercises and includes the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=business+english+pre-+intermediate+exercises+pdf
    • http://gejavoxut.sunreihealing.ca/uploads/1/3/2/6/132695829/9320101.pdf
    • http://zukuwut.californiatradewinds.com/uploads/1/3/0/7/130776257/b810465860ba.pdf
    • http://files.theatreahs.com/uploads/1/3/1/4/131409677/fubesimusov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9099/1521/files/auggie_and_me_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/17642763724.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/32348859266.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/zumubetofobinogejapif.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/sabarimala_temple_case_judgement.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/29997774977.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/medicinal_plants_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/3096/9511/files/nolenexevaf.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/mpbse_12th_admit_card_supplementary.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/26247174288.pdf
    • https://cdn.shopify.com/s/files/1/0436/6021/4425/files/chicago_manual_of_style_17th_edition_free_download.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_off0000684a.bin
fdfa844266fdd4e523de5111b05329fae1f470641ed689f4f74c4a7fb61c0921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5716 bytes
font_01_sfnt_off00007b95.bin
2efce7ab7e40088d636505c3bfb509387c7acf8cfb7972371bfedf85748c46cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B95 1832 bytes
font_02_sfnt_off00008474.bin
c38e4bcdbcb6e009a2d854ffa8a6dac623c7ce77ef4055a7d6601c270a29f6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8474 10364 bytes
font_03_sfnt_off0000a821.bin
c27f923d842fcf75914bcb38f910c7ee9e5e847eea41e4b8197fd3b1a7c12a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA821 16508 bytes

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