Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4110a1cc6dee1e9…

MALICIOUS

PDF

43.2 KB Created: 2020-08-14 13:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b1ebde70aa0de4474e05564f896760 SHA-1: 0a5763f0d77f094d905d14b9309a7e753575c980 SHA-256: c4110a1cc6dee1e9998c7357b5b3d6cb6f8198f1b1076d49ee48105a8c9e616f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, includes the URL https://ttraff.com/wb?keyword=introduction%20to%20marketing%20pdf%20notes, which is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous Shopify-hosted links, while many are benign, serves to obscure the malicious redirector.

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/wb?keyword=introduction%20to%20marketing%20pdf%20notes
    • http://pisuzet.raphaelchurch.org/uploads/1/3/1/4/131453247/remagileziw.pdf
    • http://files.vpphcc.com/uploads/1/3/0/8/130874382/xuvasi-zodewikereluva-titodiz.pdf
    • http://files.pamelabusby.com/uploads/1/3/1/4/131452878/lipolekixox.pdf
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/argumentative_essay_sentence_frames.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/zutatigixebonazofumave.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/taleziboloraba.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/48613440862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/43548610234.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/facebook_ads_manager_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0362/files/19061657982.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/esc_atrial_fibrillation_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/raspberry_pi_google_cloud_print.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/advantages_of_public_limited_company.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/harpercollins_study_bible_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9894/files/bangladesh_police_constable_job_circular_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/woguvesonixete.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_off000069ee.bin
d8405f5c6aa2a7cf118ba20fdf92d171158485b30a16e8b2d3fc9cb98a73f31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 5444 bytes
font_01_sfnt_off00007c61.bin
907b16829ec8a5b18a4239f3cc27124af751068f10be8c34c3ca1a83d1a48452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 10380 bytes

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