Malicious PDF — malware analysis report

Static analysis result for SHA-256 2539db6ded35ab40…

MALICIOUS

PDF

38.1 KB Created: 2020-07-29 17:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3791525c992a781dc0457977e756e814 SHA-1: 64e5cc153d3f9b92b0e77604718c413d91f959e7 SHA-256: 2539db6ded35ab40a0fa28e1bfde0a939ae41beacab8b7de65369ed25c657c8b
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The primary malicious URL identified is ttraff.cc, which is used to redirect users to other sites. The document body, though heavily obfuscated, suggests a lure related to IELTS reading materials, indicating a phishing or scam attempt. No scripts were extracted, limiting the analysis of direct payload execution.

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/pify?keyword=ielts+reading+actual+test+vol+5+pdf
    • http://files.sapnajawidpiracha.com/uploads/1/3/1/6/131637385/3120b9574.pdf
    • http://files.cloverdalepreschool.com/uploads/1/3/2/7/132712306/kizotile_nigopib_visotube.pdf
    • http://files.wtangofoxtrot.com/uploads/1/3/0/7/130740378/ridijimo.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/76317042961.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8127/files/62497202079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9590150980.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/50961669262.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/40501795130.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/75201133127.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/37099199823.pdf
    • https://cdn.shopify.com/s/files/1/0433/5989/5717/files/45962014232.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/50104186948.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/golidikufovafukavevedux.pdf
    • https://cdn.shopify.com/s/files/1/0433/3030/6203/files/malotexaxizufinufoluwuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/sazuzogivifonurabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/wumap.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_off00005756.bin
de2e1ce238191a4c33725001a7e9919eae529e6ea934f16c557192d82fc3de3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5756 5328 bytes
font_01_sfnt_off00006983.bin
a7318c217be670ab5b838b39da463e0391a8a2b02a29520311280f5999d970c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 9876 bytes