Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2eb93c8540f432…

MALICIOUS

PDF

41.6 KB Created: 2020-08-12 01:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca19466ffe113f2f706f77720f8d9d5 SHA-1: 38c5ef9c1d9505f5ee58dd81cf91782f52ab7975 SHA-256: 5b2eb93c8540f43208600c69a41c3f39d9d233d0f639be51bc71f7616c8fafc6
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a callback lure suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=ganoderma+lucidum+cultivation+pdf
    • http://files.cordwainerproductions.com/uploads/1/3/1/6/131606546/bunusobod_lijuludelibale_vagiwukemiselum_nowowofogaxo.pdf
    • http://files.fieldtocottage.com/uploads/1/3/1/0/131070561/valexerulifakivut.pdf
    • http://files.spacepancake.com/uploads/1/3/1/8/131857115/8023250.pdf
    • http://vuwukuxes.vega-2.com/uploads/1/3/0/7/130775320/pulesupis_kifoniwawijoj_lunevatij_vizobesura.pdf
    • http://xatas.gitaarlesdamwoude.nl/uploads/1/3/1/6/131606490/a611d04b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/marathi_barakhadi_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/4999132140.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/72138147751.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/sosazitowenadoxeluraw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9591/files/psychoterapia_poznawczo_behawioralna.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/1492724553.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/zirewepinevano.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/toefl_pbt_practice_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/contoh_soal_medan_listrik.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/mapuwapunaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/75476421806.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_off000064b3.bin
14ad83087f174a9233d7e4edc7ae549b2058ae1086dd9e34a8255fe733b15fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 5212 bytes
font_01_sfnt_off00007665.bin
f5fddb8e1dd416be13cf1641e8b0aa4b369564362700be97a543ae92ca92ad4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 10248 bytes

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