Malicious PDF — malware analysis report

Static analysis result for SHA-256 1576086506179016…

MALICIOUS

PDF

63.0 KB Created: 2020-08-14 07:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28022745558403feec676c30512a28d SHA-1: aee898fffb92c1971e1e8064ab8bbe9d1a9c5387 SHA-256: 1576086506179016b6d63614334cb0f7081dd23a7cd3c7c96e2fbb32546f51db
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=multiplying+dividing+radical+expressions+worksheet
    • http://files.noidurham.org/uploads/1/3/2/6/132682235/3250383.pdf
    • http://bezofo.ultimatemartialartsusa.com/uploads/1/3/2/7/132741024/maxovuxuromibu.pdf
    • http://pafekem.uwfkappasigma.org/uploads/1/3/0/9/130968984/87117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0448/1263/2221/files/how_to_crop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/sezedotuketus.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/42206211842.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4692/files/algorithm_design_steven_skiena.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/clinical_nutrition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/sejat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1286/5693/files/90200044697.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/63133532003.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/redidawajuwixovepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7632/1434/files/differentiation_rules_for_algebraic_functions.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/25287784057.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/66721418815.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1943/files/xelabapi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009dde.bin
e97f65f92056ef1b2aa783c59de841b044f79cbbb85a0c002f16e5de32372320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDE 5608 bytes
font_01_sfnt_off0000b10f.bin
6b7b37432743858bdebd32b940515df2f250287d57b2b9e67498ba54fa059e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB10F 15408 bytes
font_02_sfnt_off0000e070.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 4324 bytes

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