Malicious PDF — malware analysis report

Static analysis result for SHA-256 13da0049a1e09d67…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 07:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea421416d9e6144d7db3911af3a6329d SHA-1: 21e3a7eab40e894eb46e35c545b5ab6c7ee3e4f3 SHA-256: 13da0049a1e09d676be680ab948a7b58f217687db120ab689bc0bf7e7142e44d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to mimic academic resources. This suggests an attempt to direct users to malicious sites, likely for further exploitation or phishing.

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.ru/pify?keyword=mathematics+for+engineers+tony+croft+pdf
    • http://files.dwaggy.com/uploads/1/3/2/3/132303009/aea80bcf9d56f8.pdf
    • http://kajonukix.dawnhomesut.com/uploads/1/3/0/7/130776644/menakeni.pdf
    • http://jumolepax.grfoodcoop.com/uploads/1/3/1/6/131606552/zivobanirovufux.pdf
    • http://files.jrasales.com/uploads/1/3/2/6/132695258/sixonefuwowef-tekozodifufa-wuwaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/data_acquisition_system_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/dexijemupivafuridev.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/medicamentos_para_la_angina_de_pecho.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/fosibasajadopageze.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/zabosevonovomesop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/33305202614.pdf
    • https://cdn.shopify.com/s/files/1/0435/3320/5655/files/66477926778.pdf
    • https://cdn.shopify.com/s/files/1/0429/2388/4711/files/mokidudamapukiwafobajukaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/vumukakokuwuzawefor.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3413/files/mysql_uninstall_mac.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/rowubegukisufubovupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7234/files/kefewudekenufan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/lejijof.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_off00006270.bin
3ede8effc02c939eef90925093e21062079ca9c134725ff3ee19c96acf7f4120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 5644 bytes
font_01_sfnt_off0000758d.bin
04ba06817d423859dcaafc16c07bff55c9c577407f78e3b21f37c73030c3db1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 10216 bytes

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