Malicious PDF — malware analysis report

Static analysis result for SHA-256 6727ff19a1e143ce…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 14:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 428203975363edeb3ef1a4feec8d8a52 SHA-1: 0120c8b877927310f809c5c1d30266b1ae12841d SHA-256: 6727ff19a1e143ce9bd6286a8bc86bf5c1d668138684bc01535fbd64a34ec6a8
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 other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.cc/wix?keyword=romaine+lettuce+growing+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'romaine lettuce growing guide' and the malicious URL, indicating a lure to a malicious site.

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/wix?keyword=romaine+lettuce+growing+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/tokopin.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/guxaledatomawefuwajededa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/latip.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3834/files/vertical_balance_sheet_format_with_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3318/files/ap_nautilus_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/whittling_for_beginners_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/naferedefepoforakigin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/dabosukiwawemulu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0b249efba17473b8acc03b9a01d0690.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7e4032911c447a1b1c289acb84cc05b.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/onan_generator_repair.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/67528012918.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/42160575650.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_off00006ec6.bin
0cb60f64eddbbe0e70e1c9f861c6e2480a73a6297a7fe5c1b7f0cd3ad4274968
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 5180 bytes
font_01_sfnt_off0000805e.bin
a982c806be798eda54c1e6aaf29c097f8f36166f03a7c0971708e71f1be8f266
pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 10352 bytes