Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7d7bdfcc62dff3…

MALICIOUS

PDF

50.1 KB Created: 2020-09-17 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1dd41cc80ce3240ea40f5c7fdeebd1 SHA-1: e55321f228249b4328674978367c0f591dbe079a SHA-256: 5a7d7bdfcc62dff3757fe9f90ea5b0453ef6efd3e18c055d39f01be07c6699af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with at least 30 identified as part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely intended to lead users to malicious sites, potentially 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.me/pify?keyword=bond+enthalpy+equation+of+hbr
    • http://posupu.molecularultrasound.com/uploads/1/3/1/0/131071041/vasavusabufogedetov.pdf
    • http://files.buffalohats.com/uploads/1/3/0/9/130969448/30967c.pdf
    • http://diturunaj.bangsar-properties.com/uploads/1/3/1/4/131438096/tezurav-xalonubebad-tofuwizadasi-xegera.pdf
    • http://files.wellbeings-feelbetter.com/uploads/1/3/1/4/131437535/pajogudegiruzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e56fcf63-095a-4c3b-8960-d3a626cbeb4c.filesusr.com/ugd/78daac_a00b1c8d9aa24dfe96772cf557af18f1.pdf?index=true
    • https://a27a7f12-f0d4-4c72-9956-7c13b0432bf6.filesusr.com/ugd/3f8d85_921436acb46341d2bf4225bea923d8c5.pdf?index=true
    • https://819b5e83-8447-47a3-bdcb-7401c5a09107.filesusr.com/ugd/5f5755_e0816c606c844f9b859beb06343a4eb3.pdf?index=true
    • https://28d35533-7ae8-4033-b6ac-8621efde67a0.filesusr.com/ugd/e2c6c1_c5697d46adb543f98d3e3db330d75de8.pdf?index=true
    • https://0a8ee201-7bab-46de-a353-8a8ca2dd7a8b.filesusr.com/ugd/7c1f05_c79ea8308bc94dffa3096111d1119f25.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/37169202997.pdf
    • https://cdn.shopify.com/s/files/1/0461/7633/8073/files/25203209913.pdf
    • https://6bb07913-52d3-461d-b24c-1b07549e96dd.filesusr.com/ugd/6a7407_cd1411d61cb4415bab8507f06a62c46c.pdf?index=true
    • https://832496c1-4ef0-49c0-85eb-f846ce94135a.filesusr.com/ugd/e50c99_52e0813f1ec542ab85ae86d0ea61d8b8.pdf?index=true
    • https://1f6d6f1c-09eb-4d1a-a8ef-3a96f92e871a.filesusr.com/ugd/c1de29_3f9e782f290743fa889f42d43b402e08.pdf?index=true
    • https://314f486e-dd3b-4ee1-afa7-f86612257c2b.filesusr.com/ugd/5f4192_b454651e9042469aa6e5a298b337b58e.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006624.bin
850247327f6ed4daa2106ae58863a5a63a4f9f5741a5f5204fd119f495f75397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5248 bytes
font_01_sfnt_off000077e7.bin
dae830e9d9cfa4640a5d3283b86820f6f3dd5819bfff5998a177721114760411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E7 1596 bytes
font_02_sfnt_off00008001.bin
bbf3282cccf5ff8181e2075a6b02745b6aef9be28db55e2ae221c22bd246459e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 14548 bytes
font_03_sfnt_off0000ad0b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 4324 bytes

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