Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cde053137291b3…

MALICIOUS

PDF

41.5 KB Created: 2020-08-31 13:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89c9894f6a80ac854058676a7bc4ef66 SHA-1: f2da9da6cc7f8f958fc80a56b337519e63312307 SHA-256: a1cde053137291b39bed6f467a7b57e78f8c6e3919a0c25ea614a61f136373e3
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and text related to 'exercicios de mmc e mdc com gabarito', suggesting a lure to disguise the malicious intent. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to increase visibility.

Heuristics 3

  • 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.
  • 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/wix?keyword=exercicios+de+mmc+e+mdc+com+gabarito
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/academic_calendar_2020_ssa_assam_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/circuit_training_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/angielski_w_tumaczeniach_phrasal_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/kalefed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/85111974454.pdf
    • https://static.usrfiles.com/ugd/c3548c_bf7dd0491b924303a6ec220d1a5b9660.pdf
    • https://static.usrfiles.com/ugd/de65f7_4cf7309de43b4b728196ec91ee13ab80.pdf
    • https://static.usrfiles.com/ugd/913720_c5495753a04942788dcfdc45303e9639.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/aladdin_and_the_wonderful_lamp_story.pdf
    • https://cdn.shopify.com/s/files/1/0459/1832/2839/files/wapimije.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/openthos_android_os_iso.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/chava_book_download_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8624/0162/files/javupozisexojifewagu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/latex_beamer_title_page_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/seventh_day_adventist_bible_study_guide.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_off000064e3.bin
cd13c64aaa47dfdb9fdc0044b2d3d7833956b67f6f82d0765aac3f75e2e0bcc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 5392 bytes
font_01_sfnt_off00007725.bin
c2cac243e294b088c98f2530f2169953d6ef7a7d4e4326dae7600716d3dd3702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 10024 bytes

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