Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c83c87ff6ceedd2…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90279e6ced8c12038907e5d31718d362 SHA-1: 5c5b06b1518ba915894b10f71ab8efa8e362c38e SHA-256: 0c83c87ff6ceedd2ad1489e3a6b05091c7d758d31e516f2f089e9a9a1eb7f803
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure users to malicious infrastructure. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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.ru/pify?keyword=reported+speech+examples+for+class+9
    • http://lipuguwi.rrachild.com/uploads/1/3/0/7/130775162/0df38b70de7.pdf
    • http://files.crosswindsfarmcreamery.com/uploads/1/3/0/9/130969471/b675bdb3b2450.pdf
    • http://bifegofet.fitnessnco.com/uploads/1/3/0/9/130969192/9492520.pdf
    • http://files.diaryofadrummerboysmom.com/uploads/1/3/2/8/132815084/657be4e95a5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/risuxonajameken.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/nuwalofekavabugera.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/rabewokukoxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/jikewexugolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/86873755111.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/zufevujaragefaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/bipamabodomireduno.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/37562029817.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/zofisuruxubokuvupasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/boundary_setting_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/icar_net_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/41634716493.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_off00006149.bin
63933b7ae89f738d572ca4916cc843886a52553ce7a30e0e3eb9750b55026490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 5628 bytes
font_01_sfnt_off00007454.bin
f355088feb9af519a1618aef584266b0a19e2e9f3e0c52d0572e2e701c57ded5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7454 10700 bytes

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