Malicious PDF — malware analysis report

Static analysis result for SHA-256 82562fb030eda925…

MALICIOUS

PDF

37.3 KB Created: 2020-08-16 02:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6bfd9f9bc3cc972b127c69bb183995b SHA-1: bd28fb3faa82f3422efa2325cffa580021be8b32 SHA-256: 82562fb030eda9250423cae7d59fd01276b4500d790e3c1fc5305e7dd3e5dce3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to further malicious content. The document body also contains numerous links to PDFs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt to increase visibility. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful destination.

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/wb?keyword=el%20fiscal%20augusto%20roa%20bastos%20pdf%20descargar
    • http://files.nalcbranch489.com/uploads/1/3/1/3/131379236/xamapolipokazuf.pdf
    • http://teregedut.okanagan.com/uploads/1/3/1/1/131164066/5205008.pdf
    • http://novuwuku.pondsidestudio.net/uploads/1/3/1/1/131164250/4247397.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/21366162311.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/49649039059.pdf
    • https://cdn.shopify.com/s/files/1/0437/5399/6442/files/nitrogeno_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/modoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/851351250.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/43562035680.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/zujopod.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7167/files/texto_argumentativo_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/holy_bible_revised_standard_version_catholic_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/pais_vasco_historia.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000531c.bin
9935b2b8e86a90cc7328fcef1776b5c02a6b4b32c3c18d27c6151e7893771bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x531C 5420 bytes
font_01_sfnt_off0000658b.bin
03e2bde755b91021bd84b07f6f9edcad25a457914eadec2b0e0f6f921f060ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 10184 bytes