Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cb3c02e7bb13ad…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0537dcbd620b6737f6a634df926d532a SHA-1: 1edf5a8c24a1cc1790e17874e0f760e50c761c78 SHA-256: 22cb3c02e7bb13adcdb4148b6e49f369ade95fd9033a39a2fd8fda80a0c8b378
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily corrupted, contains the target URL and appears to be a lure related to educational materials. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=bncc+pdf+ensino+fundamental+ii
    • http://files.bampfa-sc.com/uploads/1/3/0/7/130738524/405bf.pdf
    • http://kovered.dndentalcare.com/uploads/1/3/1/4/131405927/3e2bd1ec88.pdf
    • http://files.jrsigningservices.com/uploads/1/3/1/4/131437848/bibapixejeteb-pekoko-winupujoxiperi-napedisakoborir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/jakigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/52186798194.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/aptoide_minecraft_0._10._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/apexogenesis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/bobanuwitenurazugugajakul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/64341052076.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/oracle_database_11g_pl_sql_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9566/files/40817828102.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/bapetilowopuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/korean_basic_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofelowuloluvazoriwonub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/algorithm_and_programming_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/ls_dyna_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7383/files/bluebeard_s_castle.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_off00006e1d.bin
7720f48d8df341f9bed7e7fa018a08adf84321046a7c5ae6ccf8a33d62a0a63b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1D 5256 bytes
font_01_sfnt_off00007ff0.bin
186ea432fc761c3a019a7482600bbdce47e2a15272ea9d8a4f405f9b8a2cd3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF0 10420 bytes