Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e01e044d0a76b6…

MALICIOUS

PDF

47.3 KB Created: 2020-08-08 04:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d489c6425ea97fca6ece8431afcb1ea9 SHA-1: a841817c0bba19d647adc8d750493a3a0eac9542 SHA-256: 79e01e044d0a76b6f84627c00c66645ba90e7e4615f8e27609f1059562519ec4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, disguised with a seemingly legitimate keyword. The document also features a large number of external PDF links, many of which point to Shopify domains, suggesting an attempt to obscure the malicious redirector or engage in SEO manipulation for malicious purposes. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=blood+relation+aptitude+questions+and+answers+pdf
    • http://files.nassaucountynyhomes.com/uploads/1/3/0/8/130814466/furidebemivif_lileruvoxewenaj.pdf
    • http://files.sasolmc.org/uploads/1/3/0/7/130739542/0d97f0e2.pdf
    • http://files.bigfootcasefiles.com/uploads/1/3/1/3/131381555/siwezoxatef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/11453870102.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0854/files/70600944892.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/xusizekasiduvalarade.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/99762419026.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/68910792249.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/2014_subaru_outback_maintenance_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/pobobop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/bijadas.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8802/files/400099714.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/apoplexie_pituitaire.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/english_b1_student_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/ganajulazexutuzafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/60078431714.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/contemporary_nutrition_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.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_off00007b54.bin
abb4084ba5bf090b073937b1075316af86eaa459f11f3dcc5f5e5b0f7ed2db40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B54 5300 bytes
font_01_sfnt_off00008d7b.bin
52dce77f480254350209767b5c8b9542e7945613048caca0fcdd7c56d1d13879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7B 9996 bytes

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