Malicious PDF — malware analysis report

Static analysis result for SHA-256 16397a4bb47c23e2…

MALICIOUS

PDF

54.0 KB Created: 2020-08-23 05:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dede6475cd35d77c6fd77136ba1d53c5 SHA-1: 818bd8acabbbe396d7d1f7d86e9849c7234c4904 SHA-256: 16397a4bb47c23e269968605720cf5144b21d496a8a1eff2ca26cf396cb36c4f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated 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.com/pify?keyword=faa+far+27+pdf
    • http://lipiwekol.cospempowered.org/uploads/1/3/0/8/130814469/3955936.pdf
    • http://seziti.bprising.com/uploads/1/3/1/3/131398027/fuxovib.pdf
    • http://files.joelemireart.com/uploads/1/3/1/6/131607027/lurinedidirej-mikadaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/85836667986.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/29090115322.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/piano_books_for_child_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/duxejagotaxipijesufidoseg.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/77852517497.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/jidibezobobux.pdf
    • https://cdn.shopify.com/s/files/1/0440/6840/5413/files/glue_job_cloudformation_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/nabovewero.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/hemostasis_and_coagulation.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6519/files/kokiwazuzowusovorano.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_off000097eb.bin
10c6d1e0fd6ae70a9041c8ddcc7149fcd6af7b7d77623ed140e455a3a80be349
pdf-font-stream PDF embedded font (sfnt) at offset 0x97EB 4992 bytes
font_01_sfnt_off0000a907.bin
9e448f82f06af0a50686f9835efb9b58e1abc3ccb1dd1e9ac99c278eb1d129ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xA907 10008 bytes