Malicious PDF — malware analysis report

Static analysis result for SHA-256 97225dae452a0e0c…

MALICIOUS

PDF

37.7 KB Created: 2020-07-29 03:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229b2bc925b28a71be011513e7e3dbb4 SHA-1: 58133607163ada747c6979cd84a90af37ce33b09 SHA-256: 97225dae452a0e0cd05cd60830ecd3bd89904a70703696c8025be92806190900
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM suggests a large number of external links are present, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to a redirector that appears to be part of a link farm strategy.

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=correcting+compound+sentences+worksheets
    • http://files.prestonsburgchurch.org/uploads/1/3/1/3/131397940/6c72b807ff1c.pdf
    • http://files.literacyessentials0-5.org/uploads/1/3/1/0/131070527/tivokujejuxududobuw.pdf
    • http://files.corrieknapp.com/uploads/1/3/1/6/131606690/82b8d5.pdf
    • http://files.dailymewscharlotte.com/uploads/1/3/2/3/132303081/rupaket_suvatum.pdf
    • http://files.dailymewscha
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/3963106494.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/61426108563.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/fafojot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/38088529904.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/71315994071.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/sulugasapakagis.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/55978516775.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/rawokafavukozutubere.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/88192065376.pdf
    • https://cdn.shopify.com/s/files/1/0434/3532/7653/files/64098815135.pdf
    • https://cdn.shopify.com/s/files/1/0428/0690/2950/files/79231076475.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c0.bin
9b06a2a12f9c3a5952130f1b7ff571a019854cf59685db6d08ab94e326467ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C0 5304 bytes
font_01_sfnt_off000068b1.bin
37b518bb4d6284f9d177c1c7717db5220c913d6db54f4ffaf51bc57809c3d05d
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B1 9596 bytes