Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cd6ce5693139f8…

MALICIOUS

PDF

48.6 KB Created: 2020-08-11 11:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 540d9798c7f66e19ca3807c629baa7f9 SHA-1: 3ad0e67df638b9b54d3c20eda3dfe4556b864cfe SHA-256: 66cd6ce5693139f8e68628989140b439adecfe3680a23954f97a57ba964c26d4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially obfuscated, contains text suggesting a lure related to a book chapter, and the presence of many external links points to a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=after+chapitre+2+pdf+vf
    • http://files.zeniefoundation.org/uploads/1/3/0/8/130874246/6626173.pdf
    • http://lowudip.mann4edu.org/uploads/1/3/1/3/131383483/df14b35d3e38371.pdf
    • http://files.djackson02.org/uploads/1/3/2/8/132814624/3560754.pdf
    • http://files.doggieandme.com/uploads/1/3/1/4/131484328/busugiwifixixa_wudejobuxewe_ludobadanexosiz.pdf
    • http://nifoseja.kylekeane.com/uploads/1/3/1/8/131856257/4f38a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/skate_3_cheats_codes_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/welebidiwenurigiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/11282459629.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/american_flag_star_stencil.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/nidanibotogapivujege.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/72631818664.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/security_risk_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/law_school_personal_statement_examples_yale.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/27031296152.pdf
    • https://cdn.shopify.com/s/files/1/0435/2471/8746/files/kuvivajegefazepatovaxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f7.bin
93b133a3fe9f28c003af8c6feadde3126f7157264357f57870290b452b471d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F7 5212 bytes
font_01_sfnt_off00007bb9.bin
1a0b3c894b1f99917ebf1c7edd894fc2142c6f8c13e107c832fb31cee9b504a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB9 11084 bytes
font_02_sfnt_off0000a000.bin
b168039b654f979c140925a464ef75142322e9f7cc9a166e601b7839e62a3bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA000 16192 bytes

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