Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea8f0563eea8cf…

MALICIOUS

PDF

54.5 KB Created: 2020-08-21 10:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19f0e0f0c3054e49e1c6ebd7a2f42df SHA-1: af69d58030c1d6f599a7f36ff27faa4fb5c77208 SHA-256: 4dea8f0563eea8cfed605c81840bb18b7eab521d995c3b5c89a2eef474d2f1c3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. 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=adp+ipay+login+pdf
    • http://files.lindathurd.com/uploads/1/3/0/7/130775053/gusisinox.pdf
    • http://files.obxshagclub.com/uploads/1/3/0/7/130775045/popijazubevaku_getegojo_datuwob.pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7317/files/26190535078.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7727/files/3787770377.pdf
    • https://cdn.shopify.com/s/files/1/0439/4136/3870/files/treatment_guidelines_for_constipation_in_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/crystal_report_runtime_version_10._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/0069/0848/files/57982442695.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/libro_caballo_de_troya_4_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/cerebral_palsy_introduction.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/4666362871.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d56.bin
d636bdf6bf8f5ddbe7d1165b375825e302c9820c1cbc9feaeb024590d7495c14
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D56 4616 bytes
font_01_sfnt_off00009d1c.bin
2dfd0fda91e5fb9f4ac450bd3320be7435c06fd30512187c27b9f35890dedac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1C 10088 bytes
font_02_sfnt_off0000bf89.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 4324 bytes