Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c14d3d64391dea…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 09:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 872fbef69423881d3edb9db4723b29c0 SHA-1: a970eae1f586b50a7cc4e6c8b431e2f29bb1d922 SHA-256: 66c14d3d64391dea7187f5629dfb8507be7541c5173bb913a6a56a856ade44bc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to direct users to potentially harmful content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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=chrome+apk++for+tv
    • http://tukozinun.howemtnknives.com/uploads/1/3/1/4/131455198/vanosano_sivejexedef_poxaruz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/vexililewumimur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/tofunuwumezejikukigax.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/waxuxifigilulebosalujavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/21519843261.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/68235178152.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/21811314514.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1382/files/avani_avittam_mantras_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0439/3651/4216/files/33392759013.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/88759165491.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_off00006338.bin
9e1dcfda30be3b023357ffca99e7280617601c79a6c4175b34b4c96ab2648e05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 4960 bytes
font_01_sfnt_off000073f7.bin
67ebed2d09f22394839b478e67a0137ddb57a2511204a0464d34fff27f32896e
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F7 11036 bytes