Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b829909cb090564…

MALICIOUS

PDF

44.5 KB Created: 2020-08-20 13:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64b0d366f682e208393a1847c4f5aaf6 SHA-1: 1fe96b60a0198abdc630470575530d752701877e SHA-256: 5b829909cb090564b7ca05771f91d78cff0c8e7422a665bb572f7db66f8eb42e
162 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ttraff.com/pify?keyword=business+letter+format+ms+word', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links and the redirector URL point towards a malicious intent, likely related to phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=business+letter+format+ms+word
    • http://xobuxo.primarytackle.com/uploads/1/3/1/0/131070571/dagogopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/dr_brian_weiss_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/bharathidasan_university_ma_english_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/python_asyncio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/tebefimusubijutisafuwikuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/degejuwetisagemudow.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/2945266278.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/lumubozotasor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/resemovixogur.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/alexa_cheat_code.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/world_edit_bukkit.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_off00007196.bin
486912a2659fd5bead48d77925fe7879869b9bbf9c559272106ecffc06423056
pdf-font-stream PDF embedded font (sfnt) at offset 0x7196 5196 bytes
font_01_sfnt_off00008331.bin
9d328c222e5c6739cceae7e64cc17a250f21c2cc17fb870f3f698fca916f46e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 10128 bytes