Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56b1c3b99b32d0c…

MALICIOUS

PDF

48.0 KB Created: 2020-08-04 05:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d542715bd3178ca3ff7985c39043b33c SHA-1: c696b8d0281400a9ed2819600770df2d7c1ca6ed SHA-256: d56b1c3b99b32d0cea3971b639ad934faedea292775005ec0f825da61b9402f3
152 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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a phishing or scam attempt designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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=alfabeto+griego+pdf+unam
    • http://vulan.yamagawabudo.com/uploads/1/3/0/7/130775403/1a36b70eefa5.pdf
    • http://files.marwoodcurno.co.uk/uploads/1/3/1/8/131856065/rafudelif.pdf
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/kasesepaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/create_webview_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6967/files/89086315217.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6135/files/36466991916.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/puzur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/wixivawujoxoxodevosof.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8320/files/nunefif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/jukewibadebupovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/13580490458.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/18226632381.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0865/files/pea_shooter_gungeon.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_off000071c4.bin
c284932146de3f57465e278d56e11b8f48858a69da6998c34dd93f35810a05be
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 5312 bytes
font_01_sfnt_off000083be.bin
c47d90e1d9cf40d14c2f2a795ac40c237914ceb83d77a239929b1c743e0b4741
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 16756 bytes