Malicious PDF — malware analysis report

Static analysis result for SHA-256 800635b6e8afee70…

MALICIOUS

PDF

41.4 KB Created: 2020-08-26 05:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 450ea1ac18a13372e382b9d81fb1d6c1 SHA-1: 7a2cbf3bcd234e17ac0753245daf87455a0ca476 SHA-256: 800635b6e8afee703fc9660fe2222f7a6119affd6b3693a51751bfde192a0d88
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a 'SE_DOWNLOAD_BUTTON' heuristic indicate a social engineering attempt to trick users into clicking the malicious link. The document body, though heavily obfuscated, contains the malicious URL, suggesting the file's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=healthy+and+junk+food+printable+work
    • http://dijufo.fremontrose.com/uploads/1/3/1/6/131606490/ba068c79.pdf
    • http://files.michaelcullipher.com/uploads/1/3/2/7/132740494/4626111.pdf
    • http://files.worthmoreministries.com/uploads/1/3/0/8/130813781/acefcb5caf3.pdf
    • http://files.hpcpet.com/uploads/1/3/1/3/131380495/726ad73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/animation_books_for_beginners_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/68788484565.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/dawiwufudur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/wiwelidaziruxonomelagure.pdf
    • https://cdn.shopify.com/s/files/1/0430/8729/8714/files/31575899335.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9725/files/convert_celsius_to_fahrenheit_android_app.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/water_vascular_system_of_starfish.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/let_us_c_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/gotuxizetizoxurosebev.pdf
    • https://cdn.shopify.com/s/files/1/0459/8677/5197/files/template_for_paying_monthly_bills.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/biohazard_logo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b6.bin
29465464add29ed23984fa6c38ce5c58a4508a4fbcedbac438fd2c8097fb90e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B6 5388 bytes
font_01_sfnt_off00007613.bin
d5f3d39327df2892d6aa5db296881b20caf04a0baadfae9f26b6e4b6c79c130a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 10120 bytes

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