Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f97d402d400c88…

MALICIOUS

PDF

37.9 KB Created: 2020-09-21 04:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077c475cd82aa41fc657b36573fb0126 SHA-1: 12907fcf621a39b0e1db976f0c7da9660aa2d0c6 SHA-256: 52f97d402d400c88183a930671bbbb50fffee2d9d2dca33e5ab6e5467af5f36a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.link/wix?keyword=vertical+and+horizontal+shifts+worksheet, which is a primary indicator of malicious intent. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting a broader distribution or SEO poisoning tactic.

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.link/wix?keyword=vertical+and+horizontal+shifts+worksheet
    • http://files.foodbiomedicalscience.com/uploads/1/3/0/8/130874055/8fa67807.pdf
    • http://lavobu.after5designs.ca/uploads/1/3/2/3/132303388/genezi_raloro.pdf
    • http://rimep.houghathleticboosterclub.org/uploads/1/3/0/7/130740437/614859.pdf
    • https://a188a3da-c12b-4b8c-a505-1f5a20e73bc9.filesusr.com/ugd/cece23_09534fbd565548c09fa42da595049357.pdf?index=true
    • https://1a41195d-2810-42bf-b6d1-e3fd2ae345f9.filesusr.com/ugd/ed2d23_28d52755c2584810b1f7c8352326a386.pdf?index=true
    • https://b3dee164-bbc6-447f-902b-bad0cd1adb32.filesusr.com/ugd/e42c35_727d25d2b1bf482e9fcd92413be043e3.pdf?index=true
    • https://a97fa617-ca2f-4de1-b00d-5db764021c25.filesusr.com/ugd/70e7d4_300625230b204040810661a1eac18591.pdf?index=true
    • https://20d448b9-b747-465e-9fab-27b1ce329e51.filesusr.com/ugd/db93e9_7dcea594d69c4cc1bcc81fff70cf3fda.pdf?index=true
    • https://bcf06f16-8126-4848-ba32-5d7d8aa0ac28.filesusr.com/ugd/ca32a8_a9f2a36302aa4eb19c4edc783bd05f63.pdf?index=true
    • https://e73380fc-a9c5-47af-9ea7-5d56044df508.filesusr.com/ugd/b361c6_799749fd17a6499a890a5dae2ac3643e.pdf?index=true
    • https://8b576f7f-f2bb-44d0-b071-f176f25e8f3c.filesusr.com/ugd/20d83a_b2ba896c34b342159263b87947895cf5.pdf?index=true
    • 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_off00005685.bin
80143361533b1c6b58cf446e2f6d17f78cb7d3fe51993e846cdfb6f836943800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5685 5280 bytes
font_01_sfnt_off00006892.bin
3c5e406bb2276ccb1c2c474f74c7f2660ab9f75abb457eaea8a350136a5fa0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 10072 bytes

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