Malicious PDF — malware analysis report

Static analysis result for SHA-256 b426265c5b252c35…

MALICIOUS

PDF

37.3 KB Created: 2020-07-29 09:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2021ca0638f82e5e74bef6afa9d58b8f SHA-1: 4f846a82e7a420e1b2ac71afdfe7a538d84033f8 SHA-256: b426265c5b252c35339b63d6b6181b0d86aaa3b849f33c561d121df4ff3267e0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The ML classifier strongly flags this PDF as malicious. The embedded content, though heavily obfuscated, appears to be part of a lure, likely related to the 'easy mandala coloring sheets' keyword in the malicious URL.

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=easy+mandala+coloring+sheets
    • http://files.virtuouschristiandating.com/uploads/1/3/1/8/131871823/7b77a.pdf
    • http://files.somethingaboutsomething.com/uploads/1/3/1/8/131856034/2994765.pdf
    • http://files.homefromhomechildcarers.co.uk/uploads/1/3/1/6/131636692/3311653.pdf
    • http://files.jrscloset.com/uploads/1/3/1/8/131871980/xavavixafol-sidago.pdf
    • http://files.virtuouschristiandating.com/uploads/1/3/1/8/131871823/7b7
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/22276261730.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/6547288041.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/19154940435.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/44759747141.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/33691381933.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/66374360261.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2819/files/vetekonapameton.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/46824127228.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/70956742593.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/mazugupu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8234/0770/files/zoxow.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_off00005787.bin
36f1b2d76948f92ebffef24d4262716ae6b8d8951bc8a369e64f465a4f877e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5787 5200 bytes
font_01_sfnt_off00006901.bin
bf41dfb8ae265274a7faf8015455029a32cde57b7e6503708f8aadbafbeb8228
pdf-font-stream PDF embedded font (sfnt) at offset 0x6901 9108 bytes