Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcf1069cf50c520…

MALICIOUS

PDF

44.2 KB Created: 2020-08-15 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5af3742bd9948c4c5827f3f58360cd SHA-1: 7f96f137af9b69d30dc23b16eb58d2742315fb38 SHA-256: 0fcf1069cf50c520716d87db9187bb11d52d0090956c2a4f7c3eb7c9a87fec80
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'malayalam movies' and the malicious URL, suggesting a lure to download content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links points to an attempt to lead the user 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=latest+malayalam+movies++link
    • http://files.financial-dynamics.biz/uploads/1/3/0/7/130776142/xibugef_mezetexumofan_nifitepajifule_wanomax.pdf
    • http://xunapome.weclub.online/uploads/1/3/0/8/130813458/0b6aa2b08e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/96371447801.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/27566778378.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/pdf_file_download_free_chaus_dictionary_marathi_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2550/files/20543415679.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/85316445342.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/25738433714.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/circulatory_system_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/27814576670.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/41947612549.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/10074484103.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/51974112201.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/bigulariwetexesoj.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_off000070a1.bin
3e62c2e71406b5028330345f6c7c8675a1eb4b7ed35699fac2110e675ba44803
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A1 4900 bytes
font_01_sfnt_off00008153.bin
3746bfa655c648804034336c209319248032df872e90bf076989aa93026fe967
pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 10152 bytes