Malicious PDF — malware analysis report

Static analysis result for SHA-256 28936cd85e492e55…

MALICIOUS

PDF

65.7 KB Created: 2020-09-09 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d723d3163b2126b9d8b2e0ca56312d99 SHA-1: 6568ada02ec12650995e58f21ba18fb250c10bcf SHA-256: 28936cd85e492e559f15bd6078d2d7f0d320e346b9fa589093e9b84aaffe63d2
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The embedded URL https://ttraff.me/wix?keyword=anabas+testudineus+pdf is the primary indicator of malicious intent, likely serving as a lure for further malicious activity. No scripts were extracted, but the PDF structure itself is indicative of a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/wix?keyword=anabas+testudineus+pdf
    • https://static.usrfiles.com/ugd/787b0a_28321569f66a4c72accf913e39209cd0.pdf
    • https://static.usrfiles.com/ugd/99a8f2_74f85a4224164a5d8d40f1cbfd772bc6.pdf
    • https://static.usrfiles.com/ugd/3d0627_ce1f784340924b908e7f85eb8f3c8c59.pdf
    • https://static.usrfiles.com/ugd/f5bc2a_1494c8fb88e84127836e1e6cdc17adb5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8860/9429/files/classification_of_matter_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/canada_work_visa_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0951/files/student_behavior_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/9824/2214/files/revinobiguwizuwad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/greedfall_romance_guide_aphra.pdf
    • https://static.usrfiles.com/ugd/b8c837_68e07adc3cec48a5ac8e7386976720b0.pdf
    • https://static.usrfiles.com/ugd/ddb60a_d9eaf7112a9a4e72ac8a98b69056888b.pdf
    • https://static.usrfiles.com/ugd/7e84b7_82eaa0225bcf48afaead9daf38bd45b6.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/lobezalexopaxireva.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/54121251681.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006074.bin
f60887e924b5cede6931b379064ac48b81a3d57ffa48f83ab1dbfef68e0cf45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 6348 bytes
font_01_sfnt_off00007612.bin
0cd2cbc38f5c427d6480635d5505313f221e0de38fab4ab406b4ec34248dc363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7612 5036 bytes
font_02_sfnt_off0000873d.bin
c1420a3babc1d2d391a9f051b40c89f9a3d24a5d33f766455d669e3e0be06ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873D 4628 bytes
font_03_sfnt_off00009633.bin
95b6d27bc761d5c41ae528c58817b23034817fc40296d87315cf52597baec777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9633 2976 bytes
font_04_sfnt_off0000a1fa.bin
a58eb1c7cfa8610e92fc8e7142e74addac01d23a333d09df6b96d6eacf5e976f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FA 6580 bytes
font_05_sfnt_off0000b354.bin
c2e66bbc546835c4e29d28b27fe315ba7c415996b4d2a7a1e3f14f90f4fd1a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 10228 bytes
font_06_sfnt_off0000d5fe.bin
06ad98859eee7b63fb04f22f2c2e95232e7613ef81ded0c84a54f56b5ebffa52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 19736 bytes

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