Malicious PDF — malware analysis report

Static analysis result for SHA-256 885b418cac913b91…

MALICIOUS

PDF

52.6 KB Created: 2020-08-11 00:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ab09497486967405f653155f0e571b SHA-1: e2deaea28f5c12434c6a9434ff57f9bac92f33aa SHA-256: 885b418cac913b917c36ed2f5d1610489683417a004cc66fd222541a6fcf923e
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'Cahier de charge' (specification document) and includes the malicious URL. The presence of a password-protected archive lure heuristic indicates a common technique for evading initial security scans, suggesting the PDF is a dropper for a subsequent malicious stage.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=cahier+de+charge+de+logiciel+de+gestion+commerciale+pdf
    • http://files.drawingacrossthelines.org/uploads/1/3/1/4/131408170/dexobugeredug-kefire-mezulilebufew-gamejaxozekidud.pdf
    • http://files.lovinlifedeepcreek.com/uploads/1/3/1/4/131406826/buvakowekoguvuxapa.pdf
    • http://files.destinationdancesb.com/uploads/1/3/0/9/130969169/d62a0e2ed84.pdf
    • http://pujan.myporos.com/uploads/1/3/1/4/131409090/latonasifenorokasas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/34464037101.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/honeywell_th8110u1003_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/75991747104.pdf
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/vutajososam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/2894043453.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/84451677395.pdf
    • https://cdn.shopify.com/s/files/1/0434/1743/6327/files/40987748088.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/suzidometuwepowudab.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0745/files/8912445375.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/10422187066.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/nugebeselat.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_off000089f4.bin
0b85cffa4a7013eaeabf8971e90161364c7e55ac8057acd1fdccb15d1f765a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F4 5476 bytes
font_01_sfnt_off00009c6a.bin
b76dd3b56a21708e0060e05d415a01d4db12350aec1b97a8877fa8408a7ed550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6A 12312 bytes

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