Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f1956fa0630bcc…

MALICIOUS

PDF

41.5 KB Created: 2020-08-30 02:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b26186f4c2e0af5fbbf7c268fa5dcf SHA-1: 337a577fd22896d55204219d5db19c5d8851fa3e SHA-256: 55f1956fa0630bcc424f10566d244a90c6d8f6b940c5a6555983060679b612db
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a phishing or scam attempt disguised as a coffee bar advertisement. The ML classifier strongly indicated maliciousness, and the presence of numerous links, including a redirector, supports this. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wix?keyword=ninja+coffe+bar
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/descargar_libro_after_2_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/differential_calculus_notes.pdf
    • https://cdn.shopify.com/s/files/1/0462/4678/9274/files/order_confirmation_template_shopify.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/miribujupak.pdf
    • https://cdn.shopify.com/s/files/1/0440/4979/3174/files/xogixizogonakofi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/42100019760.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/16792271689.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/92338389261.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/el_hobbit_4k_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/6384/4767/files/admob_banner_ad_not_showing_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/93875470152.pdf
    • https://cdn.shopify.com/s/files/1/0436/6571/9449/files/nitemurejupusewer.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_off0000642a.bin
8975a8db4d989cce90b4747597144b41b5c50fc952606adec8b1bea5445af809
pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 4852 bytes
font_01_sfnt_off000074ba.bin
980460261ad11455f1305336157be8d693a770d3b4cd8c10f63d109dcd3e9b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BA 10840 bytes