Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da7e0c8aade404…

MALICIOUS

PDF

40.7 KB Created: 2020-08-11 01:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f180f72ab7dd99b64c3024e2b5e671ac SHA-1: ea81eb69a95fe3ba788da3d8089217f8d390136f SHA-256: a4da7e0c8aade4041c7f1b70865725b4116e021218e2f9090e4de16569ce6298
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though partially corrupted, contains the text 'English grammar adverbs pdf' and the URL 'https://ttraff.com/pify?keyword=english+grammar+adverbs+pdf', suggesting a lure to download a PDF that actually leads 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.com/pify?keyword=english+grammar+adverbs+pdf
    • http://files.jordanodonnellauthor.com/uploads/1/3/0/7/130739601/4294640.pdf
    • http://files.lovelaurenalexa.com/uploads/1/3/0/9/130969306/bonibexugi_pixazapoz_goxekixiwivob.pdf
    • http://files.prideypets.com/uploads/1/3/1/4/131412558/xefekural_sukixefudutame_fifekodabipaxin.pdf
    • http://files.blindsnscreenswhangarei.biz/uploads/1/3/1/3/131379732/f6eae4e603caab.pdf
    • https://cdn.shopify.com/s/files/1/0429/0517/4183/files/42494446853.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/tozodirifulaxop.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/7209790396.pdf
    • https://cdn.shopify.com/s/files/1/0433/3230/5054/files/21743044829.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/84454820868.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/dusezilibewunujimado.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1153/files/safety_first_sign.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/moran_amarna_letters.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/acting_tips_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/34393637221.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/62993143530.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/xanitozorunas.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/18190565609.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006168.bin
7d059422716f3bd607f1289e83ed03189c1be7b36235d4b23197c0e962284d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5612 bytes
font_01_sfnt_off00007451.bin
b512fae9699166f4f66f9ef8eae1c25dffbc5e90dcd8ef732adc51002a5efda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 9940 bytes

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