Malicious PDF — malware analysis report

Static analysis result for SHA-256 638803b073475c15…

MALICIOUS

PDF

60.6 KB Created: 2020-08-31 21:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f754ee1a63546cde618977df524825ed SHA-1: 1629fdedaf0c90a653771744b4c0d4aad40704cd SHA-256: 638803b073475c1584063597c8058a85c26416e42e31f2a960e892da82fdbe36
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'fishing report' and a URL that appears to be part of a link farm. The presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/wix?keyword=jupiter+fishing+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/nuxovalumimifazewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/l_loge_du_carburateur.pdf
    • https://cdn.shopify.com/s/files/1/0447/3257/9996/files/clinical_chemistry_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/1463207186.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/2340345988.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d1c67659093413da620fc3c1c1b5d42.pdf
    • https://static.usrfiles.com/ugd/9b5f63_94da5959aa7a497ba0fba259ba64f930.pdf
    • https://static.usrfiles.com/ugd/a18aa6_91125ff871014f48934019766540e09d.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/85646233103.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/dulasojefum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0342/files/el_liberalismo_clasico.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_off0000b281.bin
9b84f7df7e0b0395eb7c1997c4ffbcfbee6aeefe41538c061152a6de04e25241
pdf-font-stream PDF embedded font (sfnt) at offset 0xB281 4912 bytes
font_01_sfnt_off0000c338.bin
f7ac4c864cfc2a6f0f879e465f1b026696c55ce02445b677689f2a7e1ae5e744
pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 10140 bytes