Malicious PDF — malware analysis report

Static analysis result for SHA-256 507f7a1f126e6db4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d61a4d257c3b66bf34ea3371b55364a SHA-1: 29c1775ebe02ad728dee396f789815b8e92b3b57 SHA-256: 507f7a1f126e6db4df6e9bed9099b67ad243feba851513a1e9fb12cf0a07a4fe
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised within content related to '1080p wallpapers for android'. This suggests a social engineering lure to trick users into visiting a malicious site. The PDF also hosts a large number of external links, many pointing to Shopify domains, which is characteristic of link farm SEO spam. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=1080p+wallpapers+for+android
    • http://files.jmcm-uganda.com/uploads/1/3/1/4/131438190/794bc2b7ce.pdf
    • http://files.photographybyajcrumley.com/uploads/1/3/0/7/130775163/sibikukepinive.pdf
    • http://files.spcottermusic.com/uploads/1/3/2/6/132681342/1780745.pdf
    • https://cdn.shopify.com/s/files/1/0433/4728/0026/files/63318730106.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/72688845386.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/51736892915.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/86841799585.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/65513548447.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/kafuv.pdf
    • https://cdn.shopify.com/s/files/1/0450/6628/9302/files/88424566505.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0039/files/adobe_photoshop_7._0_tutorials_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0119/0299/files/ximazupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/vakukofil.pdf
    • https://cdn.shopify.com/s/files/1/0436/5929/6926/files/adjectives_worksheets_for_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/8234/1781/files/eeo-_1_pay_data_reporting_2019.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_off000062b1.bin
41380de192b162d8505fa0f24c7c0d51bf8fb57f3b6ceb119e9107597dfca93f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B1 5420 bytes
font_01_sfnt_off0000753c.bin
ae1af030d4bd1953a696a33f0e7720021b359072b50ecf2632a3b0a521510f35
pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 10080 bytes