Malicious PDF — malware analysis report

Static analysis result for SHA-256 16da131aa4519ba9…

MALICIOUS

PDF

43.6 KB Created: 2020-08-16 20:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3002865a29516a871c61c973018c565f SHA-1: 008e193a3b086c357198e7e487e9f09abed4a86e SHA-256: 16da131aa4519ba935553ca065cf4e73501d14f49c9d876ada1368c93989d1b8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=carb-+x+annual+report. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to trick users into clicking it under the guise of an 'annual report'. No scripts were extracted, but the presence of malicious links strongly indicates a phishing or malware distribution attempt.

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=carb-+x+annual+report
    • http://wenupoku.expressiverhythm.com/uploads/1/3/0/8/130813458/fajuvaruwavesezizis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/flight_simulator_2018_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/7482/9987/files/kidilewelabegamob.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/92334878980.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/iphone_xs_max_original_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0428/3901/5580/files/fanogebapewujawamavaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2813/files/vixom.pdf
    • https://cdn.shopify.com/s/files/1/0448/2547/7277/files/pdf_budismo_zen.pdf
    • https://cdn.shopify.com/s/files/1/0435/2566/9028/files/vamofikikowedozikanij.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_off00006d98.bin
c9c24e45b94254bf7fce4ff10fba4c002b7244b36e72c2b947cab41d25ea220a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D98 4780 bytes
font_01_sfnt_off00007df1.bin
18760b7bf8b763368c6a5a35b5907b35518040f1ffd15a61fdbf0db1986d1b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF1 10620 bytes