Malicious PDF — malware analysis report

Static analysis result for SHA-256 423a817686976017…

MALICIOUS

PDF

46.7 KB Created: 2020-09-07 18:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 188650ffc5f780d4472621d00c478f4e SHA-1: b1b163cfec61797a5062cca5dffeb50341c5684e SHA-256: 423a8176869760174ce2a06d240982e0c54b2e744a333b2b0b10c2c0bf9d2ef7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, disguised as a document download, leads to a known malicious domain. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning tactic. While no scripts were extracted, the presence of a malicious redirector and the document's deceptive content strongly indicate a phishing or malware distribution attempt.

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.link/wix?keyword=rental+agreement+sample+in+word+format In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/rukanipojazitusag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/sagimagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/xuzewujisawapuvuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2930/6272/files/free_converter_online_multiple_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/laremomevazex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/terisakemirufunadanukoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9679/2471/files/competition_congratulations_letter_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/banoongi_main_hafiz_quran_naat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/duwederepoxakujigaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/8669/4824/files/43248969757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/sofonuxegeguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1077/6473/files/features_of_non_chronological_reports_ks2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/ca_disability_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/xaxoxewadoxaju.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off000078cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CC 5460 bytes
SHA-256: 33168bc76a910c8cba615b2eb935468668d6be5723cda5dc0168865c4ff5b720
font_02_sfnt_off00008b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B63 9272 bytes
SHA-256: 2aa4d5fae6dd94166bdad50a96490aa077a10f28c16ce31461940dd857bb9e3a

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