Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ac590e06ee2232…

MALICIOUS

PDF

45.8 KB Created: 2020-08-24 15:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80fcd24f239a6f0d85fef5c277e34ddb SHA-1: 4ddea45e48cbdeca52c48dceb8a1317ad1e9b7b2 SHA-256: 64ac590e06ee223245ce94869ffd8e6eda6374f567f815bb209e6afd28fef561
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to SEO-optimized PDF farms, and one critical link to a known malicious redirector. The document body, though partially corrupted, includes text related to 'car detailing business cards templates' and the URL for the redirector, suggesting a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.cc/pify?keyword=car+detailing+business+cards+templates
    • http://bivuta.umna.org/uploads/1/3/2/6/132696051/c67293.pdf
    • http://medobo.tlchollandlops.com/uploads/1/3/1/4/131406717/gutojos.pdf
    • http://files.realizeyourbest.net/uploads/1/3/1/3/131398281/eac69.pdf
    • http://zigazamuf.capecodspeechlanguagepathologists.com/uploads/1/3/1/4/131407300/nowegeloxojo.pdf
    • http://gavumoba.oldburyswimmingandtriathlonclub.co.uk/uploads/1/3/1/6/131606289/5219862.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/motorcycle_carburetor_tuning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0448/5450/9729/files/job_interview_dialogue_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/alimentos_que_contienen_carnitina.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/3d_animation_software.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/zefagosisobunibugofeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/16536552190.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/rubizelevuji.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/sample_file_download_more_than_10_mb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/nebepuxubaxodarek.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/antenna_array_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/rewezimafijemagalepap.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/alagappan_medicine_6th_edition_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068cf.bin
da0c010d0af9ed81c60702fe34998593593771b57ebf52764b12b9039c39875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 5328 bytes
font_01_sfnt_off00007acf.bin
d3d973afa57ffe993df562cf67f3e55d3c337e9315b57f2399cb6de4805a4698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACF 9796 bytes
font_02_sfnt_off00009c3d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3D 4324 bytes

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