Malicious PDF — malware analysis report

Static analysis result for SHA-256 559ab31b5413aeb1…

MALICIOUS

PDF

34.7 KB Created: 2020-08-17 05:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7474516834f40d50a475f0133e4f5b SHA-1: 6fe7f5968636173656eb5b988d7908107010137e SHA-256: 559ab31b5413aeb1c58a8e572e51c5736f8ae058819a9f5732248c5d9cfd3c9d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links, many of which point to redirector infrastructure. The document body contains a URL that leads to a known malicious redirector, and also lists numerous other PDF files hosted on Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the redirection of users to malicious sites via embedded links.

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.ru/pify?keyword=lagu+baby+shark+dj+remix
    • http://bimijiwil.revivallivinginteriors.com/uploads/1/3/1/4/131438025/kedovudo-fusivuzagirar-pabutorefeveju.pdf
    • http://files.rickyllamas.com/uploads/1/3/0/7/130739769/bazibizejaxonura.pdf
    • http://wawajiwil.massieherlihy.com/uploads/1/3/1/6/131636947/ritorasijunaxov.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1707/files/goletijezebarunemaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/manual_business_card_cutting_machine.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/wolunilowovoja.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/portugues_para_iniciantes_estrangeiros.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/bowimaviwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/list_of_borrowed_words_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/pdf_file_reader_download_for_computer.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/lokor.pdf
    • https://cdn.shopify.com/s/files/1/0432/2770/9597/files/wofixejamunamebadaxenuvo.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_off000048aa.bin
0c2aed39dab18296ca4c9c584e2222bd7d56d4d966687a9cad3a09689cc54675
pdf-font-stream PDF embedded font (sfnt) at offset 0x48AA 5600 bytes
font_01_sfnt_off00005b96.bin
aad4f212c3040d26530b07d298b3736bd556971235adb349c11e9c29beffd65c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B96 10128 bytes