Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90bccb6f10f6160…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 08:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1df75afa4227842f19a3b4a92f5186f SHA-1: d894ade3e49d44136c06ae7cb5d50314926bcf4e SHA-256: e90bccb6f10f61609ff91a68d8cf10a96382f245d4cad57bb73519f4ca42baaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the document's primary purpose is to drive traffic to this malicious site.

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.ru/pify?keyword=bar+cutter+machine+manual
    • http://files.shopmaisongreige.com/uploads/1/3/1/4/131406600/fejukug-sogotixuno-ridufuvojali.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/kepercayaan_animisme_dan_dinamisme.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/domestic_violence_act_mauritius.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/bisleri_advertisement_camel.pdf
    • https://cdn.shopify.com/s/files/1/0453/2374/7483/files/root_cause_failure_analysis_easa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/93131105448.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6295/files/80181028453.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/63924823992.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/gefewegeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8886/files/auto_iso_manual_mode.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/2650070980.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/gomafunegawomuze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/estudo_do_livro_de_atos_dos_apstolos.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_off00005d95.bin
1b1badff3d2976cd86fdce8eda18c7084380ab076e9c4ed9b4440f0a0de15157
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D95 4912 bytes
font_01_sfnt_off00006e19.bin
250d5e6ea9e3f694e8b43347f91f352071508402a0951565f2880c6121c42b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E19 13744 bytes