Malicious PDF — malware analysis report

Static analysis result for SHA-256 2455a76636d612bd…

MALICIOUS

PDF

50.3 KB Created: 2020-08-10 12:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52908fa173fb8eac712201f492786a7 SHA-1: 3b8505ac5ca6df1972f7d5854168eba0fcca9d4f SHA-256: 2455a76636d612bdd60692c96391b85f10c511b32a67774801d170409941968c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/pify?keyword=russian+genitive+case+exercises+pdf. The document body, though heavily obfuscated, contains this URL and other links pointing to PDF files hosted on various domains, suggesting a link-farming or redirection-based attack. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of this document.

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=russian+genitive+case+exercises+pdf
    • http://files.dianavgustafson.com/uploads/1/3/1/4/131438405/42b8726.pdf
    • http://files.kaimukiymca.org/uploads/1/3/1/6/131606822/1774693.pdf
    • http://files.miam-foundation.org/uploads/1/3/1/4/131452824/sufifep_xudav.pdf
    • http://files.marcatunm.org/uploads/1/3/1/8/131856851/6100354.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/40755887086.pdf
    • https://cdn.shopify.com/s/files/1/0437/3617/0657/files/dikezejejofibuzobib.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/73292963873.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/malizitebifara.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/tovodotelotorobeze.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/wobefixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/union_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/perowowatebid.pdf
    • https://cdn.shopify.com/s/files/1/0430/6806/3895/files/67247941778.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/breathe_on_us_chords.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_off000069ca.bin
3c2d35a1b893bc27a2689a0f5a70e21b7ae9415798febe63116d3232a8197e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CA 5428 bytes
font_01_sfnt_off00007c66.bin
0b9ff3f7bcefcd2c5afde499a107d663c3dce8e7f6207aaa8a984f8f8cec5798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C66 10136 bytes
font_02_sfnt_off00009f48.bin
192e740c4536f04bcb26e13eda5c54cd07cb0ce9f3265abea5d9cf23655e8317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F48 18404 bytes

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