Malicious PDF — malware analysis report

Static analysis result for SHA-256 76373fa932ceaffa…

MALICIOUS

PDF

41.8 KB Created: 2020-08-05 16:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1435ea0f03c4b87bdb563492158f119 SHA-1: 22b226c673dd7f02d1b261d6fc0f98b68d48797d SHA-256: 76373fa932ceaffa14fdef540ddc50626590b83f4a148d27821b685bc4db3f7b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, and one critical link to a known malicious redirector. This indicates a link farm or SEO manipulation tactic, likely intended to distribute further malware or phish for information. The ML classifier also strongly flagged this PDF as malicious.

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=new+headway+beginner+student+s+book+3rd+edition+pdf+free+download
    • http://files.nadirahjohara.com/uploads/1/3/2/7/132712358/9075282.pdf
    • http://xinul.bbhnc.com/uploads/1/3/0/7/130776158/605488.pdf
    • http://files.takeabitecc.org/uploads/1/3/0/7/130739444/dd65c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/kivujepipimegemodegurivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9292/6883/files/nubidoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/geligup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/dozibizab.pdf
    • https://cdn.shopify.com/s/files/1/0429/3974/4419/files/97797966022.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/fimimonunuretuxizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/21760438661.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/leliwezanagulagif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/tawonudijudojot.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/windows_ce_iso.pdf
    • https://cdn.shopify.com/s/files/1/0434/8854/2872/files/petiduxavowizadoloda.pdf
    • https://cdn.shopify.com/s/files/1/0434/1163/6381/files/excel_future_value.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/wulemorozoxoxulopajezuvix.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_off0000625b.bin
1c21e3f2cde3c1d0ac809d4aadfb87de7a9a520bcdccade7fa79b8bb834cc76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 5836 bytes
font_01_sfnt_off00007650.bin
615e3228383fd45ac3470453ca79fad819ba7a81c8fea17694200dd4018bca61
pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 10316 bytes