Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c33129002d1aad6…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 17:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99998e65aeb12cf2b1bd99df5515a4b3 SHA-1: 02136e47b4855d3ea37b8267425561abeadfb0e9 SHA-256: 5c33129002d1aad681c7726bc060d2a5af0fe6418ac6dee93c69e013e5b2f358
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to accounting policies, aligning with the 'SE_INVOICE_LURE' heuristic. The primary malicious URL, 'https://ttraff.ru/wix?keyword=tipos+de+polizas+contables+y+su+defi', is likely used to redirect the user to further malicious content or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=tipos+de+polizas+contables+y+su+defi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b58d21_478386f854e84efb8de5178b147e4675.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6b3c6a83be949d4a88bb468d67fe287.pdf
    • https://static.usrfiles.com/ugd/b8c837_09866f46679549229b369d8bef85c2c7.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/gapafobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/gemogopolusirewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4099/6518/files/report_bug_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/caffe2_android_nnapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/68917904691.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/some_applications_of_trigonometry_class_10_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/gdpr_compliant_privacy_policy_template_small_business.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/mexujexumujesetopati.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bujiwitedo.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_off00006c32.bin
5385f3b63ad4f9f092c083106fd8d8f36c32f8c1bbdfeb0ecd18eeb2cca51278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C32 5296 bytes
font_01_sfnt_off00007e4e.bin
0eeb972615623390eca41110d7f9d4b5a307355d6e26c4f1421a6b94c5f29667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 11100 bytes

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