Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bfb40e35fab25d…

MALICIOUS

PDF

42.1 KB Created: 2020-07-09 22:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b0fe1f0686949e64e99666ea2369eb SHA-1: ddbfba13637a4c40598c7a77e88d748c7f6c1c30 SHA-256: 65bfb40e35fab25da7cb38db9fddc78d599364783e541476aff8e435298e8f1c
154 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, masquerading as a resource for math worksheets. One of these links, 'https://ttraff.cc/wb?keyword=tons%20of%20free%20math%20worksheets%20at%20www.mathworksheetsland.com%20answer%20key', points to known malicious redirector infrastructure. The document body itself is heavily obfuscated, but the presence of numerous SEO-optimized PDF links suggests a link farm or SEO poisoning attack. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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/wb?keyword=tons%20of%20free%20math%20worksheets%20at%20www.mathworksheetsland.com%20answer%20key
    • http://files.onesailorsjourney.com/uploads/1/3/2/6/132696330/zusuzuwerusiv.pdf
    • http://files.divinesoulenergy.com/uploads/1/3/0/9/130969819/d55ccdadbe3c.pdf
    • http://files.dyaelkelley.com/uploads/1/3/1/8/131871956/weluxumijeno.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • http://files.reacheproject.com/uploads/1/3/1/4/131437319/cdc5c138b18527.pdf
    • http://files.craftanddesignliverpool.co.uk/uploads/1/3/2/6/132696280/rulizutosigu_tedozuraro.pdf
    • http://files.frankiegardiner.com/uploads/1/3/0/7/130740127/8397813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://felorige.files.wordpress.com/2020/07/5295627673.pdf
    • https://zifufenusudo.files.wordpress.com/2020/06/54567228127.pdf
    • https://wifobawixobi.files.wordpress.com/2020/06/22477453775.pdf
    • https://berixuv.files.wordpress.com/2020/07/56966319220.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14985018959.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067be.bin
eee5030648a6bb478fc6d55a1b02f1368ddc8fd37572526339e0f01e42f5d6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BE 5240 bytes
font_01_sfnt_off0000796f.bin
e3f007048883dd105bcf951dbf1da798607779e986ebfa971dfc6f81118db2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 9876 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.