Malicious PDF — malware analysis report

Static analysis result for SHA-256 858a59c0344c3592…

MALICIOUS

PDF

41.2 KB Created: 2020-08-06 05:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb87a732d4e0aebff9efd980da49dfb SHA-1: 320d320dfceb12a4ed7577df67a3a4d42783918b SHA-256: 858a59c0344c3592bccf2ca69d74a53592593141287343611d63f89c9cb07f5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The document body, though obfuscated, contains text that appears to be a lure for an invitation, and the embedded URLs likely lead to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the redirector and link farm findings.

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=carte+d+invitation+mariage+pdf
    • http://files.nationalpolygraphacademy.com/uploads/1/3/1/3/131379181/sonafojiki-bufinajorisotol-vawiwab.pdf
    • http://files.aptecintl.com/uploads/1/3/1/4/131454696/c44c62fe598.pdf
    • http://files.compassionatepathways.org/uploads/1/3/0/7/130775195/fd70bf150548.pdf
    • http://files.latinahilara.com/uploads/1/3/1/3/131379894/nejofemuzufopat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/75868173114.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/novosumezaged.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/4640180338.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wajomuxufukurojudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/boosting_in_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/dabal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovutuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6084/files/76123116811.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/tcp_ip_sockets_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/alveolite_allergique_extrinseque.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_off00005a0a.bin
4d94f341fccfc2c6ab6cf8c747f5b5b190c6d591bbf548b9ef2dd0fc73217a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0A 5116 bytes
font_01_sfnt_off00006b6b.bin
d11a78785aae7dc0c88496bc1c84480995c2163126ac50107bcffaee902b4839
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6B 14316 bytes