Malicious PDF — malware analysis report

Static analysis result for SHA-256 da99101c3f399224…

MALICIOUS

PDF

52.3 KB Created: 2020-07-25 17:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11bb38844ecbf199a895be5f21278633 SHA-1: e950599148c604164d1ab18856084f9a78733be7 SHA-256: da99101c3f399224c599a5352f23d8ad64687087596400f29c5dbaae6ebc42df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains embedded links that redirect to a known malicious domain (ttraff.com) disguised as a resource for CV templates. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on cdn.shopify.com, suggesting a link farm used for SEO poisoning or traffic redirection. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=best+cv+templates+2018+word
    • http://files.paperandpoppies.com/uploads/1/3/1/4/131437421/kijutik.pdf
    • http://files.nurrd.com/uploads/1/3/2/7/132710795/zagezekozalasodo.pdf
    • http://files.numanagement.net/uploads/1/3/2/7/132741176/7941509.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/vapokepovofanipadobikimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/kojalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/94156967265.pdf
    • https://cdn.shopify.com/s/files/1/0434/3866/9976/files/34382334686.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5303/files/lakibogibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4882/files/gexajilifewigol.pdf
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/3557926111.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/xopemubixugexerobabanima.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/51338816764.pdf
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/75413635080.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/43382618115.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/loxapemirewota.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/52087759292.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/92837761296.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/
    • https://cdn.shopify.com/s/files/1/0431

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ef9.bin
4d7435bac8aaf84dce766488501bc6596147a91b88d09da8ffb7bdc27b5c64ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF9 5576 bytes
font_01_sfnt_off0000a205.bin
293434a9092710bdb1c4ce6b8beecdad16ba6be96dc74537736d8b88a0a43ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA205 10052 bytes

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