Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b594b160d4d223a…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 19:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdee9b4c1f47a18662e0e1b74e97ceff SHA-1: 68cf3a381a31953882bd3ba37a2c240294645fb9 SHA-256: 0b594b160d4d223ac71c1b3cc9f8237a8d7c7485ba3a110eecf94a26ea44c89d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains the same malicious URL, indicating an intent to redirect the user. The ML classifier strongly supports the malicious verdict.

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=behavioral+interview+questions+and+answers+for+retail
    • http://files.aliceinfinitycosplay.com/uploads/1/3/0/9/130969315/8d4bd1cd.pdf
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdf
    • http://files.sgionet.com/uploads/1/3/0/8/130874413/zujojunejiguwimurob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7723/6904/files/materiales_dentales_libro.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/dbt_jrf_contingency_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/59725847508.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/34949436172.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/govajijolexujid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/fomow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1059/files/42140047114.pdf
    • https://cdn.shopify.com/s/files/1/0440/2089/1798/files/alexander_osterwalder_business_model_generation.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/applied_calculus_4th_edition_hughes_hallett.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_off00007dbc.bin
a67e27200a2ba2f3ad0c8d3b99411a297b02f4b522de6ec051d69e7e886fcfb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBC 5324 bytes
font_01_sfnt_off00008fe3.bin
eadcb5bde4217bb0964b43abededfd0e15ea089dde31f473cbab05d947c3e9b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE3 10120 bytes