Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b52eb99ec1f9249…

MALICIOUS

PDF

89.6 KB Created: 2020-08-23 22:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32f54d16e32857767c4d43c0a4454063 SHA-1: fe82599f9f1d1f5d75f710a70b16e078b96e981a SHA-256: 6b52eb99ec1f9249bdfd18aca508450c413f5573174c5613ac92e91621a1b8c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics, suggesting the document's primary purpose is to redirect users to malicious infrastructure.

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.cc/pify?keyword=syllable+structure+pdf
    • http://biwadexek.invergowriehomestead.com/uploads/1/3/1/4/131437657/sisofot-ledademufira-legififotovul-kexodudirater.pdf
    • http://kobixi.myberrygoodlife.com/uploads/1/3/1/4/131454807/bipisowixivukelale.pdf
    • http://files.sippicanband.com/uploads/1/3/1/6/131606368/webimumapesomilor.pdf
    • http://files.johnbhenry.com/uploads/1/3/2/6/132681877/e038bb59d6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/3888655851.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/stroker_and_hoop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/39781959336.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/bottom_bracket_types.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1885060089.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/partner_visa_australia_form_40sp.pdf
    • https://cdn.shopify.com/s/files/1/0457/9409/9366/files/ecb_guidelines_model_risk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6246/7489/files/neligosowuzedizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0813/0197/files/93058064540.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/68292193816.pdf
    • https://cdn.shopify.com/s/files/1/0437/5642/1278/files/filisad.pdf
    • https://cdn.shopify.com/s/files/1/0429/0579/6774/files/migosomigep.pdf
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/ccim_ci_101_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011544.bin
f52c96b40db16f8acab32332d2a30c2d08dd8cb296ee0a27c4560f40c3feeaae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 5112 bytes
font_01_sfnt_off000126b5.bin
1b9c9d359fa30d932ab367ff4a0c880d8598003cd5aa1e8a6be5054a0d492457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 10664 bytes
font_02_sfnt_off00014b26.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B26 4324 bytes

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