Malicious PDF — malware analysis report

Static analysis result for SHA-256 538e383666851ecf…

MALICIOUS

PDF

38.4 KB Created: 2020-08-04 19:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d57771d65d4b7e2982f99f00434f0c3 SHA-1: c864c7fab7d33c83eb2a0c76dbcf725c938f2fa5 SHA-256: 538e383666851ecf0f26280946f15f14e022133547d44e99a39aeb5e6e2665a8
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wb?keyword=chain%20rule%20worksheet%20easy, which is a primary indicator of the malicious intent to redirect the user. The presence of numerous Shopify-hosted PDF links suggests an attempt to obscure the final malicious destination.

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.com/wb?keyword=chain%20rule%20worksheet%20easy
    • http://files.catarellaphoto.com/uploads/1/3/2/6/132681823/gokamuzisega-fegegix-tolelokazovojiz.pdf
    • http://files.volleytech.ca/uploads/1/3/1/4/131409074/5543572.pdf
    • http://files.ibstonecircle.co.uk/uploads/1/3/2/6/132682976/e55a22bf8b1.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/discord_text_colors.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/womal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/fagebadek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/lozalimubetu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/63500275847.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/50606398269.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0440/7099/4085/files/45942801258.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/44411106834.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/62014986796.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/76263050980.pdf
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/ginikuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/jalodaxelevevikevixug.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_off00005adc.bin
062704504a92c3e40c033d9bd8306819a29a3b2fc8dde96623cc5e8e5f2f0a8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADC 4936 bytes
font_01_sfnt_off00006baf.bin
9868e68f262dc2949cb39b6d2beaec14a2003f8f802d0780ad935f37d60da57a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAF 9664 bytes