Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4054c373f9dc67…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 13:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9440daa57ea6656c45ab736e4332cd0f SHA-1: ad7b3c54d8a1129b116349305f157076fd284ddf SHA-256: 5a4054c373f9dc670d9d18ae0ccd8c23ef4b9201e1aa148b6bdb79b90df41394
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector URL. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=alcoholicos+anonimos+libro+azul+pdf
    • http://files.digitalbayllc.com/uploads/1/3/1/6/131637477/kagetowi.pdf
    • http://files.lamarrministriesllc.com/uploads/1/3/1/8/131872238/dofok-sidedufarum-sesevun-miwekub.pdf
    • http://vasapa.vitalnutritioncapecod.com/uploads/1/3/1/4/131406717/kesobenul-gifadijem.pdf
    • http://files.ocracokesportfishing.com/uploads/1/3/0/8/130813834/fb14aa13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/vogixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/xisuzetazivetabogerole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/lepitodubejaxale.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/vatutif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/apple_iphone_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/brahmo_samaj_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/37076167195.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/copilot_bike_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/12138307719.pdf
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/reriboxiwak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/gopatovadaw.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_off000069a4.bin
af824e6bf313428fa98c6a6d5a780fd67a05d888780dda43ba6735829d2f1583
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A4 5576 bytes
font_01_sfnt_off00007c70.bin
14a2a4184fe75133577b75ace8f5b69ef4984ea6a0cefbd9e94cb7c4f067b911
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C70 11036 bytes