Malicious PDF — malware analysis report

Static analysis result for SHA-256 61afc4de3e11b59d…

MALICIOUS

PDF

38.1 KB Created: 2020-08-15 03:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e92ede8e3f35f70bda61af74c2c489 SHA-1: 53c4abb0f007979079ea15224d80794ba70495c3 SHA-256: 61afc4de3e11b59d5d8742cd7e2ce49c47af8fada78ec2f52d374e050b54bb39
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a manual, which is a common lure for phishing or malware distribution. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/wb?keyword=cdj%202000%20nexus%202%20manual%20pdf
    • http://bofupup.essentialoils4that.com/uploads/1/3/1/4/131407552/6124074.pdf
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdf
    • http://napupas.christiansciencecrystallake.org/uploads/1/3/1/0/131070450/c6783f16ddb4.pdf
    • http://files.thebeanstalkproject.org/uploads/1/3/0/8/130874539/xibufajasixujegud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/credo_catolico_largo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/atv61_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/7766/2875/files/tajora.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/wutonezakuzo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/solo_guitar_arrangements.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/83002105259.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/todibovutusefozefos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5459/6250/files/59101908841.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/ecology_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/saxupenasariwexi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/rizajonowovipuloz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a2f.bin
13b9e8c7cc9debf375eae6329c9b67b6d1c917d2813d26457f83103a36c3a5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2F 5176 bytes
font_01_sfnt_off00005bbe.bin
a86ada52df98d9be88d31098af617d21305f32fb1258d02492fb5468d5ec2352		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBE 9848 bytes
font_02_sfnt_off00007d7d.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7D 4324 bytes

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