Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df23a30bfd99521…

MALICIOUS

PDF

41.4 KB Created: 2020-08-06 21:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992a959b7d83eccc10353bd0a4418e8b SHA-1: 8e56aa1c8153e539599277c1f0b23f11029ee42d SHA-256: 9df23a30bfd995219f24e256379a7d81e79750f1a135e1b76bd6cfe04a5f03bb
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body and extracted URLs suggest a lure related to a 'birdman book pdf', which is likely a pretext to get the user to click the malicious link. The PDF also contains a large number of external PDF links, many pointing to Shopify, which is characteristic of SEO link farm abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=birdman+book+pdf
    • http://files.birthto5partnerships.org/uploads/1/3/0/7/130775260/ripemelobokuw.pdf
    • http://files.miamibeautyboutique.shop/uploads/1/3/2/6/132696233/9175067.pdf
    • http://files.wisbeywoodworking.com/uploads/1/3/1/4/131407511/55a66e3446a.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/bagigo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/10409846051.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8359/files/capital_expenditure_and_economic_growth.pdf
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/97943262727.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/dezezisogukukamamaxom.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9574/files/music_an_appreciation.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7637/files/mortal_kombat_snes_controls.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7505/files/building_skills_for_the_toefl_ibt_writing.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/bipaxaluvevukebaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8932/files/vapijusape.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/auditing_assurance_services_and_ethics_in_australia_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/shaymin_sky_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/tasuxiwew.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_off00006476.bin
1e7f256248919b516c8b1afb666e93fc41275d57b9a6f1f537eb103097906edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6476 5232 bytes
font_01_sfnt_off0000762b.bin
44558ee4604e04c4f6a6967dad2611fe4011845a1da2f4fa6d8398e80a9917af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 10120 bytes

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