Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a79bcbc75872f1…

MALICIOUS

PDF

48.7 KB Created: 2020-08-11 16:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 560273cac5ae9fe95d2e1e656f0bdac8 SHA-1: 9bb468e11841b4e1dd44afa2cd5c63ce84a38357 SHA-256: 76a79bcbc75872f11b6604c2a797bdbcd4121a2537f9de4021fe5b86c64dbe34
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also features a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. While no scripts were extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a harmful site, likely for phishing or malware distribution.

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=anne+rice+la+belle+au+bois+dormant+pdf
    • http://files.bridgeandcivil.com/uploads/1/3/1/4/131407227/14ebeb.pdf
    • http://gukaduw.one21i.com/uploads/1/3/1/4/131438474/pexireretot_zejipevefavibat.pdf
    • http://files.vermontcustomfitness.com/uploads/1/3/2/7/132740586/3521859.pdf
    • http://gonix.webuyjunkcarstrucksvansingeorgia.com/uploads/1/3/0/7/130776433/a01643.pdf
    • http://kexav.stocktonkiwanis.com/uploads/1/3/1/3/131384429/5993658.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/vunuma.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/media_queries_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/11639687049.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/kidogibuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/buwov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/cellule_staminali_tumorali.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/recovery_server_could_not_be_contacted_mojave.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/sukivigiweludovedox.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/18109496519.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/79444090102.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/64615222498.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/69948429631.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_off00008007.bin
d6d1eb9e86362976bead0ad93cfbf3b05764cfc3c79e2017713a664b3f5cbb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8007 5432 bytes
font_01_sfnt_off0000924f.bin
ea1ac83efbd69d7432f9db7bdbcef4c3ca2529c52dfd077a1bd83419fcc429fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924F 10368 bytes

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