Malicious PDF — malware analysis report

Static analysis result for SHA-256 188c44dfb25fc879…

MALICIOUS

PDF

42.2 KB Created: 2020-08-22 03:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2089bdda41df5f6bffe9b96d3ff151ef SHA-1: bdfdf60a6f0c58cc12c014b48ca51911d885ed51 SHA-256: 188c44dfb25fc8797623154e8b1ba6ca1f4d0140361a9ec557c78e9788adbdb5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=formal+letter+template+ielts'. The document body, though heavily obfuscated, also contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=formal+letter+template+ielts
    • http://files.teddfish.com/uploads/1/3/0/9/130969791/f9794f7171.pdf
    • http://files.inmanhardware.com/uploads/1/3/2/6/132681450/jedawalenibexu_popetup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/kuvexojafilowivoxexofidok.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/xabokosi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6317908028.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/93954837995.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/86890856804.pdf
    • https://cdn.shopify.com/s/files/1/0430/1851/8681/files/anchor_bolt_capital_performance.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/14237417710.pdf
    • https://cdn.shopify.com/s/files/1/0447/9284/0349/files/base_de_datos_oracle.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/wotid.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/wintrobe_s_clinical_hematology_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/poweredge_t30_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/abstract_frame_background_vector_free.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_off000068d8.bin
44eacd9938159f41673f5aad25416e9f8b5952c3ec549b1e491767a62b4a604e
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D8 4920 bytes
font_01_sfnt_off00007979.bin
69697d9a208e5864ed6d9ac7667f8ccf785e87834cebfccd9a765e05983fff25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7979 10244 bytes