Malicious PDF — malware analysis report

Static analysis result for SHA-256 513b9b83cd814ce9…

MALICIOUS

PDF

46.6 KB Created: 2020-08-14 20:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39f6120fd67d22626c54da5ff2483fc SHA-1: 5d8a9d39d9db2da3d3b8ecbbda6f0921b0dfcc9a SHA-256: 513b9b83cd814ce9526ccf4f018968369db308e962c082f8a7eb7d234a4ead16
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. This indicates a phishing attempt to lure users to malicious content under the guise of a business newspaper PDF.

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/wb?keyword=business%20newspaper%20pdf
    • http://files.trailbrake.net/uploads/1/3/2/6/132681880/75afce4d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/negarisejolulim.pdf
    • https://cdn.shopify.com/s/files/1/0429/0360/1308/files/23196234419.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/5468601726.pdf
    • https://cdn.shopify.com/s/files/1/0447/8153/5389/files/non_cognitive_skills.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/59111410876.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/gulisetunut.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/code_of_honor_alan_gratz_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/sejarah_kota_lama_semarang.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/53840244745.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/wuxowasekonidus.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079c3.bin
890d1f9ffe5cebf68391f63c728232961d5555ce34ba25c284a45b2bee5fb25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C3 5144 bytes
font_01_sfnt_off00008b60.bin
0ea37752f608e4199d9884902b1017a18a55364549cad591e5f8897cda17feec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 10120 bytes

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