Malicious PDF — malware analysis report

Static analysis result for SHA-256 15786092d94c4871…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 14:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561171f0454b6cbe3d3430d21c197c56 SHA-1: fa5d9a9672d16cf1c5a8982e01ca2acf3bcd1f82 SHA-256: 15786092d94c4871fb0b0111a38ba8d5e119310b312844e5bee2f439e977cfcb
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicated maliciousness. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The presence of a 'download button' lure reinforces the deceptive nature of the document.

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=viva+video++for+pc+filehippo
    • http://files.dimensionsinglassfl.com/uploads/1/3/1/4/131413718/ec930.pdf
    • http://files.jacksfinewooddesigns.com/uploads/1/3/1/4/131453198/af7c16da4aca1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0463/7248/7323/files/canciones_cristianas_acordes_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/74298434029.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/mujumilozalebuval.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/xigugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/copenhagen_adductor_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6794/files/fabametow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/important_days_download_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8921/files/lab_report_titration_of_acids_and_bases.pdf
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/download_novel_alma_aridatha.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5555796470.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_off00005d48.bin
c5bb54d2ff877700832ea4435bcc204afbd85265492d372ae1310dd26f1bab17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D48 4692 bytes
font_01_sfnt_off00006d4c.bin
a51e35b8e06128e0576199c2b587cd8d66216545b49325fa15cf654c305ef353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 10036 bytes
font_02_sfnt_off00008f9e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9E 4324 bytes

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