Malicious PDF — malware analysis report

Static analysis result for SHA-256 7181694e4aea0979…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 22:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dce0c1e93f9fdbf9c265ba1717e56b3 SHA-1: d040dd239034d95db91f981b68f45e077cdb85e4 SHA-256: 7181694e4aea0979e78215af34267cae9eaccc0afe31baa5f903c97c8f9f6b3b
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text suggesting it is a 'study guide' and includes the malicious URL, indicating a lure to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/wix?keyword=ches+exam+secrets+study+guide+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_832aecef188b4b538cd4dcace800634b.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_0e1a002f30f8452f9b041fc3fd508221.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccfb64e812744ad59232504a28e0ace2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f2b7d9a47da44d293e0ccd689a5c3cd.pdf
    • https://static.usrfiles.com/ugd/55cc32_17d7c5dbacca4e73ab482219b5af3a93.pdf
    • https://static.usrfiles.com/ugd/64d889_291633b5595741799434f6d44ef285d5.pdf
    • https://static.usrfiles.com/ugd/91e123_fff5e07831d7434c8bb4b7ea775125c1.pdf
    • https://static.usrfiles.com/ugd/b56239_707caa7a5b864d9b96eb773e3f74c8ae.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/open_channel_hydraulics_akan.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/xidixefipeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/bebigutabozikujetedaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/20327295063.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3639/files/75397144988.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/stripe_atlas_tax_guide.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_off0000663c.bin
35476c44aeaee19fdbee3e231670d6eddfee69d8708d5523513f8eb7591c4008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5612 bytes
font_01_sfnt_off0000793c.bin
1b80fd5a1bc191c72d044e88901fbccadfbb0bf037b1bb29f833f3597168587c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 10872 bytes

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