Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e0e255d89a0e3f…

MALICIOUS

PDF

55.1 KB Created: 2020-08-14 11:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f19daa5cd19b80d8361759a408df474 SHA-1: f8bc41dd957f1a79334c42b0e359f0826d6a2222 SHA-256: 65e0e255d89a0e3fad90a2ff6db3bd76c3107f1c3365054fc777dfdbb00792e4
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this redirector. This suggests a phishing or scam attempt where the user is tricked into clicking the link, likely to download further malware or be directed to a malicious site. The ML classifier also strongly indicated maliciousness.

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.
  • 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.ru/pify?keyword=kanji+practice+sheets+n4
    • http://files.kpmtx.com/uploads/1/3/0/9/130969080/7615760.pdf
    • http://murowur.hostmaster.abodeinteriordesigns.co.uk/uploads/1/3/1/0/131071157/1204787.pdf
    • http://files.shopsweetcreations.com/uploads/1/3/1/4/131483337/67c146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9716/9824/files/cuales_son_los_valores_eticos_fundamentales.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/brag_the_art_of_tooting.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/13282919939.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/7113461103.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/49188021415.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/32257079460.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/naxuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/odisha_b._ed_entrance_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/21164493445.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_off000062bf.bin
c0903bfcf976a1c35a3ac8317003dd13033483fd1b06bdc22f95f495006b152e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BF 16684 bytes
font_01_sfnt_off000098a4.bin
0e3886a30c1c7c9815f930be3819a5ffbc1068e8cd10afdd8ea2bfa9daa7f32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A4 5124 bytes
font_02_sfnt_off0000aa16.bin
b7dcec2de65a885c2558619eb28eca9ea0c6c0e5aef0808c484d7f901c99141b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA16 11580 bytes

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