Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4b38da5418e3d3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 06:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e51c6e2087359e346547fd0a44952c8 SHA-1: d1894f27d6a139fae317875e73514f45062d37fe SHA-256: 6c4b38da5418e3d313d4eb547ee23c8de2e76a21d6b32f477157e41abf90a699
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or to download further malicious 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.cc/pify?keyword=ascanio+condivi+pdf
    • http://files.maribellyspartysupplies.com/uploads/1/3/0/7/130776131/6371255.pdf
    • http://files.edenpchurch.org/uploads/1/3/1/3/131383283/8468300.pdf
    • http://files.omegambt.com/uploads/1/3/1/8/131856146/9689931.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/volewisafuwus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/zaximizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/antimicrobial_resistance.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/abdul_hameed_adam_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/70889407297.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/9697231564.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/48812903742.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/9245628964.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5910/files/83775981845.pdf
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/baravosuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/wilson_stringing_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/certificado_medico_similares.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/gedodopubok.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_off00007299.bin
a708b20f4c7eaaa20024c86c390c94052dfc53a2f7c3ce8357628d3125082a21
pdf-font-stream PDF embedded font (sfnt) at offset 0x7299 5068 bytes
font_01_sfnt_off000083ed.bin
b54cfd9f3fa6f282a04c3cb2840e778748b08023e6b82691310111874cdd1823
pdf-font-stream PDF embedded font (sfnt) at offset 0x83ED 11292 bytes