Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8944d86caa5e53…

MALICIOUS

PDF

37.4 KB Created: 2020-08-22 01:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd5bf44c7c00e8e43ecae51a1886150 SHA-1: 90b5519024eb78b33a866c4ed8c757f1314df87c SHA-256: 8d8944d86caa5e53420aa2e0e796a8b842fb157769d88665778fc6392cf57030
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Android 8 one handed mode' and the malicious URL, suggesting a lure. The PDF also contains a large number of external links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or to host malicious content.

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.cc/pify?keyword=android+8+one+handed+mode
    • http://files.egfeducationfoundation.org/uploads/1/3/0/8/130874587/rerorupoxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/avast_android_antivirus_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/appendix_cites.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/resume_atomistique_s1_smpc.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/fobawiwu.pdf
    • https://cdn.shopify.com/s/files/1/0451/8828/4565/files/ceiling_fan_installation_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/rugodiruzuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/jarate.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9633/files/xetireluludiwamiposod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/bsf_tradesman_recruitment_2020_form.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_off000054f3.bin
e6467060f3a66d869bd512f310b8740e441f2b9f6ed517e377c93052aee58be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F3 5040 bytes
font_01_sfnt_off000065e2.bin
56f9152720df8ed9761df8fb2e8f4c09bc470fe46f6fa58bdb0a1bf705ceb52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 10452 bytes

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